Iowa Late Fee Calculator
Your late fee
$100.00
At the legal limit
Paid 12 days late; the lease has no grace period.
The lease asks for $100.00, exactly the most Iowa Code § 562A.9(4) permits on these figures.
- Days past due
- 12 days
- Grace period ends
- No grace period
- Earliest fee date
- September 29, 2026
- Lease late fee
- $20.00/day × 12 days, at most $100.00 = $100.00
- Legal maximum
- $100.00
- Rent + late fee
- $1,350.00
Limit set by Iowa (monthly rent of $700 or less: $12 per day, capped at $60 in total; above $700: $20 per day, capped at $100 in total): $100.00 for 12 days
rent > $700: $20.00/day × 12 days = $240.00 (cap $100.00)
Iowa names no earliest day for a late fee in the quoted law; the earliest fee date above follows the lease's grace days.
Next step: turn these figures into a late rent notice for the tenant.
Iowa rent late fee law
Iowa ties the late fee limit to the rent: for rent of up to $700 a month, no more than $12 a day and $60 a month in total; for rent above $700, no more than $20 a day and $100 a month in total.
4. For rental agreements in which the rent does not exceed seven hundred dollars per month, a rental agreement shall not provide for a late fee that exceeds twelve dollars per day or a total amount of sixty dollars per month. For rental agreements in which the rent is greater than seven hundred dollars per month, a rental agreement shall not provide for a late fee that exceeds twenty dollars per day or a total amount of one hundred dollars per month.
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 Iowa 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 $100.00.
Amount now due
- Unpaid rent
- $1,250.00
- Late charge
- $100.00
- Total
- $1,350.00
Please pay $1,350.00 at your earliest opportunity.
If this letter crossed with your payment, please disregard it.
Regards,
[Your name or company]
How to use the Iowa 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, the earliest fee date and the most Iowa Code § 562A.9(4) allows, then copy the figures or print a late rent notice.
Work out interest on an overdue B2B invoice under Iowa law. The legal default rate — what applies when the contract is silent — is 5%, and the statute is quoted verbatim below. All math runs locally in your browser.
Legal rate absent a written agreement; open accounts start 6 months after the last item. A separate variable rate governs once suit is filed.
Late fee breakdown
- Interest owed
- —
- Daily rate
- —
- Total (invoice + interest)
- —
Still unpaid? Generate a formal demand letter — it computes the interest and cites Iowa's statute (Iowa Code § 535.2) for you.
Worked example: Iowa invoice interest at 5%
Interest at Iowa's statutory default of 5% a year, worked out with the same formula as the calculator above: amount × (5% ÷ 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 | $4.11 | $8.22 | $12.33 |
| $5,000.00 | $20.55 | $41.10 | $61.64 |
| $10,000.00 | $41.10 | $82.19 | $123.29 |
What Iowa law says about invoice interest
Except as provided in subsection 2, the rate of interest shall be five cents on the hundred by the year in the following cases, unless the parties shall agree in writing [...] The following persons may agree in writing to pay any rate of interest [...] (5) A person borrowing money or obtaining credit for business or agricultural purposes
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 Iowa — written B2B contracts
No statutory cap
Business or agricultural credit is exempt: parties may agree in writing to any rate, with no usury defense or penalty. The floating cap binds only consumer deals.
Basis: Iowa Code § 535.2(2)(a)(5). 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 Iowa's landlord-tenant law. On the Rent tab, Iowa Code § 562A.9(4) is checked against your lease figures and quoted in full. Consumer credit has separate, stricter rules. The distinction is explained in B2B invoice late fees vs. residential rent.
Use this data
Iowa'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.
Iowa late fee FAQ
Is there a legal limit on rent late fees in Iowa?
Iowa ties the late fee limit to the rent: for rent of up to $700 a month, no more than $12 a day and $60 a month in total; for rent above $700, no more than $20 a day and $100 a month in total. Source: Iowa Code § 562A.9(4), checked 2026-10-03; the Rent tab quotes it word for word.
How do I work out a late fee on rent in Iowa?
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, the most Iowa Code § 562A.9(4) allows and rent plus fee, and turns them into a late rent notice.
Can I charge late fees on overdue invoices in Iowa?
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: 5%. Legal rate absent a written agreement; open accounts start 6 months after the last item. A separate variable rate governs once suit is filed. Statute: Iowa Code § 535.2, verified 2026-08-19. Consumer and rent debts follow separate laws.
What is the maximum late fee on a B2B invoice in Iowa?
For a written B2B contract: Floating cap for ordinary written agreements (10-yr Treasury monthly average +2 pts, set monthly by the Superintendent of Banking) — business credit is exempt. Basis: Iowa Code § 535.2(2)(a)(5). 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 Iowa?
The statutory default rate of 5%. Legal rate absent a written agreement; open accounts start 6 months after the last item. A separate variable rate governs once suit is filed. Statute: Iowa Code § 535.2 (verbatim quote on this page, verified 2026-08-19).
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 — Iowa's row was last verified 2026-08-19. 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). For rent, the Rent tab quotes Iowa Code § 562A.9(4) word for word, links its source and gives the date it was checked (2026-10-03).
Not legal advice. This page summarizes Iowa Code § 562A.9(4) and Iowa'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.