Oklahoma Late Fee Calculator
Your late fee
$62.50
Paid 12 days late; the lease has no grace period.
- Days past due
- 12 days
- Grace period ends
- No grace period
- Earliest fee date
- September 29, 2026
- Lease late fee
- 5% of $1,250.00 = $62.50
- Rent + late fee
- $1,312.50
Oklahoma: 41 O.S. contains no late fee provision, so there is no legal cap or waiting period to apply; only your lease terms count.
Next step: turn these figures into a late rent notice for the tenant.
Oklahoma rent late fee law
Oklahoma's title 41 on landlords and tenants, which contains its Residential Landlord and Tenant Act, has no late fee provision, so it neither caps a late rent fee nor gives a grace period.
Read in full for this check: Oklahoma Statutes, title 41 (Landlord and Tenant), including the Oklahoma Residential Landlord and Tenant Act (41 O.S. sections 101 to 136). Official source · checked .
Late rent notice builder
Before you send it: this builds a reminder letter about overdue rent and a late charge. It is not an eviction notice. A notice to pay rent or quit is a separate document, and Oklahoma has its own rules for it. Nothing on this page is legal advice.
[Your name or company]
Date: October 10, 2026
To: [Tenant name]
[Rental property address]
Re: Overdue rent for [Rental property address]
Dear [Tenant name],
This letter is a reminder that the rent of $1,250.00 for [Rental property address] was due on September 28, 2026. As of October 10, 2026, $1,250.00 of it is still unpaid (12 days past due).
Your lease provides for a late charge, which comes to $62.50.
Amount now due
- Unpaid rent
- $1,250.00
- Late charge
- $62.50
- Total
- $1,312.50
Please pay $1,312.50 at your earliest opportunity.
If this letter crossed with your payment, please disregard it.
Regards,
[Your name or company]
How to use the Oklahoma rent late fee calculator
- Enter the monthly rent and the rent that is overdue.
- Enter the date the rent was due and the date it was paid, or today if it is still unpaid.
- Choose how the lease sets the late fee (percent of rent, flat amount or dollars per day) and type the figure from the lease.
- Enter the grace days written in the lease.
- Read the late fee and the earliest fee date, then copy the figures or print a late rent notice.
Work out interest on an overdue B2B invoice under Oklahoma law. The legal default rate — what applies when the contract is silent — is 6%, and the statute is quoted verbatim below. All math runs locally in your browser.
Legal rate absent a contract rate; liquidated sums earn interest from the day the right to recover vested.
Late fee breakdown
- Interest owed
- —
- Daily rate
- —
- Total (invoice + interest)
- —
Cap in the statute: 10% per annum — the constitutional line "in the absence of legislation fixing maximum rates of interest"; where no rate is agreed, not more than 6% (Okla. Const. art. XIV, § 2). The full cap rules are in the maximum late fee section below.
Still unpaid? Generate a formal demand letter — it computes the interest and cites Oklahoma's statute (15 O.S. § 266; Okla. Const. art. XIV, § 2) for you.
Worked example: Oklahoma invoice interest at 6%
Interest at Oklahoma's statutory default of 6% a year, worked out with the same formula as the calculator above: amount × (6% ÷ 365) × days. If your contract states its own rate, enter that rate in the calculator instead.
| Invoice amount | 30 days late | 60 days late | 90 days late |
|---|---|---|---|
| $1,000.00 | $4.93 | $9.86 | $14.79 |
| $5,000.00 | $24.66 | $49.32 | $73.97 |
| $10,000.00 | $49.32 | $98.63 | $147.95 |
What Oklahoma law says about invoice interest
[...] in the absence of legislation fixing maximum rates of interest, all contracts for a greater rate of interest than ten percent(10%) per annum shall be deemed usurious; provided, further, that in contracts where no rate of interest is agreed upon, the rate shall not exceed six percent (6%) per annum.
Quoted verbatim from the linked official source — not our paraphrase. How we source and re-check every row is documented in the data methodology.
Maximum late fee in Oklahoma — written B2B contracts
Hard cap 10% (constitutional).
10%/yr constitutional ceiling is the residual rule for ordinary B2B contracts; no blanket business exemption. Higher rates need a specific statute (licensed/consumer regimes).
Basis: Okla. Const. art. XIV §2; 15 O.S. §266. Compare all 51 jurisdictions in the maximum late fee by state table and cap-regime map.
Rent and invoices follow different laws — consumer debt is not covered
The Invoice tab, the rate card and the statute sections on this page are about business-to-business invoices. Residential rent late fees live in Oklahoma's landlord-tenant law. Oklahoma: 41 O.S. contains no late fee provision, so there is no legal cap or waiting period to apply; only your lease terms count. Consumer credit has separate, stricter rules. The distinction is explained in B2B invoice late fees vs. residential rent.
Use this data
Oklahoma's row — rate, cap, citation, verbatim quote, verification date — is part of our open 51-jurisdiction dataset: CSV · JSON (CC BY 4.0, cite myinvoicetemplate.com). Set late-fee terms on your next invoice with the free invoice generator, or state them clearly using the wording guidance in the payment terms guide.
Oklahoma late fee FAQ
Is there a legal limit on rent late fees in Oklahoma?
Oklahoma's title 41 on landlords and tenants, which contains its Residential Landlord and Tenant Act, has no late fee provision, so it neither caps a late rent fee nor gives a grace period. Read in full for this check: Oklahoma Statutes, title 41 (Landlord and Tenant), including the Oklahoma Residential Landlord and Tenant Act (41 O.S. sections 101 to 136), checked 2026-10-03. The late fee and grace days in the lease decide.
How do I work out a late fee on rent in Oklahoma?
Enter the monthly rent, the overdue amount, the date the rent was due and the date it was paid, then the late fee in the lease (a percent of rent, a flat amount or dollars per day) and its grace days. The calculator gives the late fee, the earliest fee date and rent plus fee, and turns them into a late rent notice.
Can I charge late fees on overdue invoices in Oklahoma?
Yes — on business-to-business invoices. If your contract or invoice states a late-fee rate, that rate governs (subject to the cap rules below). If nothing was agreed: 6%. Legal rate absent a contract rate; liquidated sums earn interest from the day the right to recover vested. Statute: 15 O.S. § 266; Okla. Const. art. XIV, § 2, verified 2026-08-21. Consumer and rent debts follow separate laws.
What is the maximum late fee on a B2B invoice in Oklahoma?
For a written B2B contract: 10% constitutional ceiling as the residual rule; statutes authorize higher rates for various licensed/consumer lending regimes. Basis: Okla. Const. art. XIV §2; 15 O.S. §266. The full cap analysis is on the Invoice (B2B) tab; this covers business-to-business deals only — consumer credit has stricter separate caps.
What interest applies if my contract doesn't mention late fees in Oklahoma?
The statutory default rate of 6%. Legal rate absent a contract rate; liquidated sums earn interest from the day the right to recover vested. Statute: 15 O.S. § 266; Okla. Const. art. XIV, § 2 (verbatim quote on this page, verified 2026-08-21).
Where does this data come from, and when was it verified?
Every invoice-interest figure on this page comes from our 51-jurisdiction dataset: each row researched against the controlling statute or the state's official current-rate page, independently re-checked, and stamped with its own verification date — Oklahoma's row was last verified 2026-08-21. The operative legal text is quoted verbatim on this page with a link to the official source, the methodology is public, every verification pass is logged in the changelog, and the full dataset is downloadable (CC BY 4.0).
Not legal advice. This page summarizes Oklahoma's commercial-interest statute for general information, with the verification date shown above — it tells you when we last confirmed the figures, not that they are still current today. Statutes change and courts interpret them; verify the cited statute at the official source, or ask a licensed attorney in your state, before charging a late fee or demanding interest.