Installment Payment Agreement Template: Payments & Terms

Installment Payment Agreement Template: Payments & Terms

Installment Payment Agreement Template: Payments & Terms

Installment Payment Agreement Template: Payments & Terms

Typical length: 4-6 pages

Length: 4-6 pages

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Installment Payment Agreement Template


This Installment Payment Agreement (“Agreement”) is made as of [Date] (“Effective Date”) by and between:

Seller / Creditor:
[Seller/Creditor Legal Name]
[Entity Type or “Individual”]
[Address]
[City, State/Province, ZIP/Postal Code, Country]
Email: [Email]
Phone: [Phone Number]

Buyer / Debtor:
[Buyer/Debtor Legal Name]
[Entity Type or “Individual”]
[Address]
[City, State/Province, ZIP/Postal Code, Country]
Email: [Email]
Phone: [Phone Number]

Seller and Buyer may each be referred to as a “Party” and together as the “Parties.”


1. Purpose of Agreement

The purpose of this Agreement is to set out the terms under which Buyer will pay Seller for the following goods, services, or debt balance by installments.


2. Description of Goods / Services / Debt

Buyer agrees to purchase from Seller, and Seller agrees to provide to Buyer, the following (“Subject Matter”):

[Description of goods, services, or existing debt being paid off]

Any additional details may be attached as Exhibit A – Description of Goods/Services and are incorporated into this Agreement.


3. Purchase Price and Down Payment

3.1 Total Amount.
The total amount to be paid by Buyer under this Agreement is [Total Amount in Numbers and Currency] ([Total Amount in Words]) (the “Total Amount”).

3.2 Down Payment.
Buyer shall pay a down payment of [Down Payment Amount and Currency] on or before [Down Payment Due Date].

3.3 Amount to Be Paid in Installments.
After the down payment is received, the remaining balance of [Balance Amount and Currency] (the “Installment Balance”) shall be paid according to the installment schedule in Section 4.


4. Installment Schedule

4.1 Number and Amount of Installments.
Buyer shall pay the Installment Balance in [Number] installments, each in the amount of [Installment Amount and Currency], unless adjusted as permitted by this Agreement.

4.2 Due Dates.
Each installment is due on [Due Day, e.g., “the 1st day of each month”] starting on [First Due Date] and ending on [Final Due Date].

4.3 Payment Method.
All payments shall be made in [Currency] by [Bank Transfer / Check / Electronic Transfer / Other] to the following details, unless Seller provides updated details in writing:

  • Account Name: [Account Name]

  • Bank Name: [Bank Name]

  • Account Number / IBAN: [Account Number / IBAN]

  • SWIFT / BIC (if applicable): [SWIFT/BIC]

  • Payment Reference: [Reference for Buyer to include]


5. Interest and Charges (Optional)

5.1 Interest.
The unpaid portion of the Installment Balance shall bear interest at a rate of [Interest Rate]% per year, calculated on a [simple / compound] basis from [Interest Start Date] until paid in full.

5.2 Inclusion of Interest in Installments.
The installment amounts in Section 4 either:

  • Include interest (principal and interest combined); or

  • Exclude interest, which will be added and shown in a separate statement.

[Select one option and delete the other.]

5.3 Legal Limits.
If the agreed interest or charges exceed the maximum allowed by applicable law, they shall automatically be reduced to the lawful maximum, and any excess already paid shall be treated as a payment toward principal.


6. Late Payments and Default

6.1 Late Payment.
A payment is late if it is not received within [Number] days after the due date.

6.2 Late Fee.
For each late installment, Buyer shall pay a late fee of [Late Fee Amount or Percentage], subject to applicable legal limits.

6.3 Default.
Buyer will be in default under this Agreement if:

  • Any installment remains unpaid more than [Number] days after its due date; or

  • Buyer materially breaches any other obligation under this Agreement and does not correct the breach within [Number] days after written notice from Seller.

6.4 Acceleration.
Upon default, Seller may, by written notice to Buyer, declare the entire remaining unpaid balance (including any interest and fees that have accrued) immediately due and payable.

6.5 Collection Costs.
If Seller reasonably incurs costs to collect overdue amounts after default, Buyer shall pay reasonable collection costs, including reasonable attorney’s fees and court costs, to the extent permitted by law.


7. Ownership, Security, or Collateral (Optional)

7.1 Retention of Title (for Goods).
Unless stated otherwise in this Agreement, legal title to any goods shall remain with Seller until the Total Amount and all interest and fees (if any) have been paid in full. Buyer shall not sell, transfer, or encumber the goods before title passes without Seller’s written consent.

[Alternatively or additionally:]

7.2 Collateral.
As security for Buyer’s obligations, Buyer grants Seller a security interest in the following property (“Collateral”):

[Description of collateral]

Buyer agrees to sign any documents needed to record or perfect Seller’s security interest as required by law.


8. Prepayment

8.1 Right to Prepay.
Buyer may prepay all or part of the remaining balance at any time without penalty, unless prohibited by applicable law.

8.2 Application of Prepayments.
Unless required otherwise by law, any prepayment shall be applied first to any accrued interest and fees (if any) and then to the remaining principal balance.


9. Representations and Covenants

9.1 Buyer’s Statements.
Buyer represents that Buyer has read and understands this Agreement, has the legal capacity to enter into it, and is not relying on any promises or statements that are not written in this Agreement.

9.2 Seller’s Statements.
Seller represents that Seller has the right to enter into this Agreement and to receive payments under it.

9.3 Change of Contact Details.
Each Party shall promptly notify the other in writing of any change in address, email, or phone number.


10. Notices

10.1 Form of Notice.
Any formal notice under this Agreement must be in writing and sent by hand, mail, courier, or email to the contact details shown at the beginning of this Agreement, or to any updated details provided in writing.

10.2 Effective Date of Notice.
Notices will be considered received on the date of actual delivery or, for email, on the date sent if no error or bounce-back message is received.


11. Governing Law and Dispute Resolution

11.1 Governing Law.
This Agreement shall be governed by and construed in accordance with the laws of [State/Province, Country], without regard to conflict-of-law rules.

11.2 Dispute Resolution.
If a dispute arises in connection with this Agreement, the Parties shall first try in good faith to resolve it through informal discussions. If they cannot resolve the dispute within [Number] days after one Party sends a written notice of dispute, either Party may pursue [court proceedings / mediation / arbitration] in [City, State/Province, Country].


12. Miscellaneous

12.1 Entire Agreement.
This Agreement is the entire agreement between the Parties regarding the Subject Matter and replaces all prior oral or written understandings on the same subject.

12.2 Amendments.
Any change to this Agreement must be in writing and signed by both Parties.

12.3 No Waiver.
If a Party does not enforce a right under this Agreement, it does not mean that the Party has waived that right for future situations.

12.4 Severability.
If any provision of this Agreement is found invalid or unenforceable, the remaining provisions shall continue in full force and effect.

12.5 Assignment.
Buyer may not assign or transfer this Agreement without Seller’s written consent. Seller may assign this Agreement in accordance with applicable law, upon written notice to Buyer.

12.6 Counterparts and Electronic Signatures.
This Agreement may be signed in counterparts. Signatures transmitted electronically (including scanned or digital signatures) shall be treated as originals.


13. Signatures

IN WITNESS WHEREOF, the Parties have executed this Installment Payment Agreement as of the Effective Date written above.

Seller / Creditor

Signature: _______________________________
Name: [Authorized Signatory Name]
Title: [Title, if applicable]
Date: [Date]

Buyer / Debtor

Signature: _______________________________
Name: [Authorized Signatory Name]
Title: [Title, if applicable]
Date: [Date]

Installment Payment Agreement Template


This Installment Payment Agreement (“Agreement”) is made as of [Date] (“Effective Date”) by and between:

Seller / Creditor:
[Seller/Creditor Legal Name]
[Entity Type or “Individual”]
[Address]
[City, State/Province, ZIP/Postal Code, Country]
Email: [Email]
Phone: [Phone Number]

Buyer / Debtor:
[Buyer/Debtor Legal Name]
[Entity Type or “Individual”]
[Address]
[City, State/Province, ZIP/Postal Code, Country]
Email: [Email]
Phone: [Phone Number]

Seller and Buyer may each be referred to as a “Party” and together as the “Parties.”


1. Purpose of Agreement

The purpose of this Agreement is to set out the terms under which Buyer will pay Seller for the following goods, services, or debt balance by installments.


2. Description of Goods / Services / Debt

Buyer agrees to purchase from Seller, and Seller agrees to provide to Buyer, the following (“Subject Matter”):

[Description of goods, services, or existing debt being paid off]

Any additional details may be attached as Exhibit A – Description of Goods/Services and are incorporated into this Agreement.


3. Purchase Price and Down Payment

3.1 Total Amount.
The total amount to be paid by Buyer under this Agreement is [Total Amount in Numbers and Currency] ([Total Amount in Words]) (the “Total Amount”).

3.2 Down Payment.
Buyer shall pay a down payment of [Down Payment Amount and Currency] on or before [Down Payment Due Date].

3.3 Amount to Be Paid in Installments.
After the down payment is received, the remaining balance of [Balance Amount and Currency] (the “Installment Balance”) shall be paid according to the installment schedule in Section 4.


4. Installment Schedule

4.1 Number and Amount of Installments.
Buyer shall pay the Installment Balance in [Number] installments, each in the amount of [Installment Amount and Currency], unless adjusted as permitted by this Agreement.

4.2 Due Dates.
Each installment is due on [Due Day, e.g., “the 1st day of each month”] starting on [First Due Date] and ending on [Final Due Date].

4.3 Payment Method.
All payments shall be made in [Currency] by [Bank Transfer / Check / Electronic Transfer / Other] to the following details, unless Seller provides updated details in writing:

  • Account Name: [Account Name]

  • Bank Name: [Bank Name]

  • Account Number / IBAN: [Account Number / IBAN]

  • SWIFT / BIC (if applicable): [SWIFT/BIC]

  • Payment Reference: [Reference for Buyer to include]


5. Interest and Charges (Optional)

5.1 Interest.
The unpaid portion of the Installment Balance shall bear interest at a rate of [Interest Rate]% per year, calculated on a [simple / compound] basis from [Interest Start Date] until paid in full.

5.2 Inclusion of Interest in Installments.
The installment amounts in Section 4 either:

  • Include interest (principal and interest combined); or

  • Exclude interest, which will be added and shown in a separate statement.

[Select one option and delete the other.]

5.3 Legal Limits.
If the agreed interest or charges exceed the maximum allowed by applicable law, they shall automatically be reduced to the lawful maximum, and any excess already paid shall be treated as a payment toward principal.


6. Late Payments and Default

6.1 Late Payment.
A payment is late if it is not received within [Number] days after the due date.

6.2 Late Fee.
For each late installment, Buyer shall pay a late fee of [Late Fee Amount or Percentage], subject to applicable legal limits.

6.3 Default.
Buyer will be in default under this Agreement if:

  • Any installment remains unpaid more than [Number] days after its due date; or

  • Buyer materially breaches any other obligation under this Agreement and does not correct the breach within [Number] days after written notice from Seller.

6.4 Acceleration.
Upon default, Seller may, by written notice to Buyer, declare the entire remaining unpaid balance (including any interest and fees that have accrued) immediately due and payable.

6.5 Collection Costs.
If Seller reasonably incurs costs to collect overdue amounts after default, Buyer shall pay reasonable collection costs, including reasonable attorney’s fees and court costs, to the extent permitted by law.


7. Ownership, Security, or Collateral (Optional)

7.1 Retention of Title (for Goods).
Unless stated otherwise in this Agreement, legal title to any goods shall remain with Seller until the Total Amount and all interest and fees (if any) have been paid in full. Buyer shall not sell, transfer, or encumber the goods before title passes without Seller’s written consent.

[Alternatively or additionally:]

7.2 Collateral.
As security for Buyer’s obligations, Buyer grants Seller a security interest in the following property (“Collateral”):

[Description of collateral]

Buyer agrees to sign any documents needed to record or perfect Seller’s security interest as required by law.


8. Prepayment

8.1 Right to Prepay.
Buyer may prepay all or part of the remaining balance at any time without penalty, unless prohibited by applicable law.

8.2 Application of Prepayments.
Unless required otherwise by law, any prepayment shall be applied first to any accrued interest and fees (if any) and then to the remaining principal balance.


9. Representations and Covenants

9.1 Buyer’s Statements.
Buyer represents that Buyer has read and understands this Agreement, has the legal capacity to enter into it, and is not relying on any promises or statements that are not written in this Agreement.

9.2 Seller’s Statements.
Seller represents that Seller has the right to enter into this Agreement and to receive payments under it.

9.3 Change of Contact Details.
Each Party shall promptly notify the other in writing of any change in address, email, or phone number.


10. Notices

10.1 Form of Notice.
Any formal notice under this Agreement must be in writing and sent by hand, mail, courier, or email to the contact details shown at the beginning of this Agreement, or to any updated details provided in writing.

10.2 Effective Date of Notice.
Notices will be considered received on the date of actual delivery or, for email, on the date sent if no error or bounce-back message is received.


11. Governing Law and Dispute Resolution

11.1 Governing Law.
This Agreement shall be governed by and construed in accordance with the laws of [State/Province, Country], without regard to conflict-of-law rules.

11.2 Dispute Resolution.
If a dispute arises in connection with this Agreement, the Parties shall first try in good faith to resolve it through informal discussions. If they cannot resolve the dispute within [Number] days after one Party sends a written notice of dispute, either Party may pursue [court proceedings / mediation / arbitration] in [City, State/Province, Country].


12. Miscellaneous

12.1 Entire Agreement.
This Agreement is the entire agreement between the Parties regarding the Subject Matter and replaces all prior oral or written understandings on the same subject.

12.2 Amendments.
Any change to this Agreement must be in writing and signed by both Parties.

12.3 No Waiver.
If a Party does not enforce a right under this Agreement, it does not mean that the Party has waived that right for future situations.

12.4 Severability.
If any provision of this Agreement is found invalid or unenforceable, the remaining provisions shall continue in full force and effect.

12.5 Assignment.
Buyer may not assign or transfer this Agreement without Seller’s written consent. Seller may assign this Agreement in accordance with applicable law, upon written notice to Buyer.

12.6 Counterparts and Electronic Signatures.
This Agreement may be signed in counterparts. Signatures transmitted electronically (including scanned or digital signatures) shall be treated as originals.


13. Signatures

IN WITNESS WHEREOF, the Parties have executed this Installment Payment Agreement as of the Effective Date written above.

Seller / Creditor

Signature: _______________________________
Name: [Authorized Signatory Name]
Title: [Title, if applicable]
Date: [Date]

Buyer / Debtor

Signature: _______________________________
Name: [Authorized Signatory Name]
Title: [Title, if applicable]
Date: [Date]

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Installment Payment Agreement Template: Payments & Terms

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For quick answers, scroll below to see the FAQ.

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For quick answers, scroll below to see the FAQ.

Frequently asked, Private payment plans

Installment Payment Agreement , free template + 12-month schedule calculator (2026)

An installment payment agreement is a private contract where a buyer or borrower pays a fixed total over scheduled installments, used for private loans, vehicle sales, dental and tuition plans, and B2B invoices. It is NOT the same as an IRS Installment Agreement (Form 9465), which is for federal tax debt. Eight FAQs cover IRS disambiguation, the math, notarization, interest caps, default, and how this differs from a promissory note or a loan agreement. Below the FAQ: a live 12-month schedule calculator, three worked examples, and a decision matrix.

Not an IRS Installment Agreement. If you owe back federal taxes and want a payment plan with the IRS, you need IRS Form 9465 at irs.gov, not this template. This template is for private contracts between people or businesses.
01IRS disambig

Is an installment payment agreement the same as an IRS installment agreement?

No, they are completely different documents.

An installment payment agreement (this template) is a private contract between two parties (a buyer and seller, or a borrower and lender) for paying a fixed total over scheduled installments, used for car sales, dental work, tuition, business invoices, or personal loans. An IRS Installment Agreement (Form 9465) is a request you submit to the federal government to pay back taxes you already owe to the IRS, usually over 6 months to 6 years. If you are trying to pay off tax debt, you need IRS Form 9465 at irs.gov, not this template. If you are documenting a private payment plan between people or businesses, you are in the right place.

02Math

How do I calculate a 12-month installment payment?

Divide the total amount by 12 for an interest-free plan: $12,000 / 12 = $1,000 per month.

With interest, the formula is more involved. For a $12,000 plan at 6% APR over 12 months, monthly payment is $1,032.83, total paid is $12,394.00, and total interest is approximately $394.00. For a $24,000 plan at 0% APR over 12 months, monthly is $2,000. We include a live 12-month schedule calculator below that handles these calculations, including amortization breakdown showing principal, interest, and remaining balance for each month. The formula is M = P × r × (1+r)^n / ((1+r)^n - 1) where P is principal, r is monthly interest rate (annual / 12 / 100), and n is the number of payments.

03Notarization

Does an installment payment agreement need to be notarized?

No federal law requires notarization, but it is strongly recommended for amounts over $10,000 and for any agreement secured by collateral.

Some states require notarization for specific secured transactions (UCC-1 filings, vehicle bills of sale tied to installment payments, mortgage-adjacent agreements). Notarization protects against signature-forgery defenses if the borrower later disputes the agreement. As an alternative, two witnesses (unrelated, of legal age) plus signatures can provide similar evidentiary protection. For unsecured amounts under $10,000 between trusted parties, signatures alone are usually enough.

04Usury

What interest rate can I charge on a private installment payment agreement?

You can charge interest, but state usury laws cap the maximum.

Most states cap legal interest at 6% to 10% per year for unwritten agreements and 10% to 18% for written agreements, with some states (Delaware, South Dakota) allowing higher rates. California’s general usury cap is 10% for personal loans; New York’s criminal usury threshold is 25%; Texas allows up to 18% by default, higher with specific contract language. The federal Truth in Lending Act (TILA) also requires disclosure of the APR, finance charge, and total of payments for any consumer credit agreement with more than 4 installments. If the borrower is a business, TILA usually does not apply. Stay within your state’s cap; usurious rates make the agreement unenforceable and expose the lender to penalties.

05Default

What happens if the borrower misses an installment payment?

The agreement should answer this in advance with a three-stage default clause.

  • Stage 1 (Days 1 to 5 after due date): Grace period, no action.
  • Stage 2 (Days 6 to 15): Notice of late payment, late fee applies (typically 5% of the missed installment or a flat $25 to $50, whichever is greater).
  • Stage 3 (Day 16+): Default declared, acceleration clause triggered, meaning the entire remaining balance becomes immediately due.

The lender can then sue for the full balance, file a UCC-1 to enforce collateral, or report to credit bureaus. Some agreements add a 30-day cure window before acceleration. Whichever structure you pick, write it into the agreement explicitly; courts will not impose default rules that are not in the contract.

06Validity

Is a handwritten or DIY installment payment agreement legally binding?

Yes, in most cases.

A handwritten agreement signed by both parties is legally binding as long as it identifies the parties, the amount, the payment schedule, and any interest, and as long as both parties sign and date it. Electronic signatures via DocuSign, HelloSign, Adobe Sign, and similar tools are valid in all 50 states under the federal E-SIGN Act and the Uniform Electronic Transactions Act (UETA). For amounts over a state-specific threshold (typically $500 to $5,000), the Statute of Frauds requires the agreement to be in writing, but a handwritten document satisfies that. The biggest risk with DIY agreements is not enforceability, it is omission: missing acceleration clause, missing default cure period, missing TILA disclosures (for consumer credit). Use a structured template like the one below.

07Compare

Installment payment agreement vs promissory note vs loan agreement, what is the difference?

Three related but different documents.

  • An installment payment agreement is a payment-plan contract; it documents that one party owes a total amount and will pay it back in scheduled chunks. It is often used in conjunction with a sale (the buyer pays the seller over time).
  • A promissory note is a one-sided written promise to pay; the borrower signs, the lender does not, and it is the simpler instrument for one-time personal loans between individuals.
  • A loan agreement is more formal and bilateral; it includes representations, warranties, conditions precedent, covenants, default remedies, and often collateral, and is used for business loans or larger sums (typically $25,000+).

Use an installment payment agreement when documenting a sale-plus-payment-plan or a structured plan between known parties. Use a promissory note for simple personal loans. Use a loan agreement for business or larger secured loans.

08Collateral

Can I add a personal guarantee or collateral to secure the agreement?

Yes, and both significantly reduce default risk.

A personal guarantee is a separate signature where a third party (a parent, business partner, spouse) agrees to pay if the primary borrower defaults; commonly used for small-business installment sales. Collateral is property the lender can repossess on default; for vehicle installment sales the vehicle itself is the collateral, secured via a UCC-1 financing statement filed with the state Secretary of State and a corresponding notation on the title. For equipment or business assets, UCC-1 alone is enough. For real estate, you would switch from an installment payment agreement to a mortgage or deed of trust. Add collateral clauses to the agreement, file the UCC-1 promptly, and keep the filing renewed every 5 years.

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