South Dakota 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
South Dakota: SDCL chapters 43-32 and 21-16 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.
South Dakota rent late fee law
South Dakota's codified laws on leases of real property (SDCL 43-32) and on eviction actions (21-16) contain no late fee provision, so they neither cap a late rent fee nor give a grace period.
Read in full for this check: South Dakota Codified Laws, chapter 43-32 (Lease of Real Property) and chapter 21-16 (Forcible Entry and Detainer). 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 South Dakota 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 South Dakota 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 South Dakota law. The legal default rate — what applies when the contract is silent — is 15%, and the statute is quoted verbatim below. All math runs locally in your browser.
Category F default rate when no written rate is fixed, from the day the balance is due/ascertained.
Late fee breakdown
- Interest owed
- —
- Daily rate
- —
- Total (invoice + interest)
- —
Cap in the statute: 18% — the most an interest rate that only appears on a bill, statement, or invoice may carry; a rate fixed by written agreement is governed by SDCL 54-3-1.1 instead (SDCL 54-3-5). 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 South Dakota's statute (SDCL 54-3-5, 54-3-16, 54-3-1.1) for you.
Worked example: South Dakota invoice interest at 15%
Interest at South Dakota's statutory default of 15% a year, worked out with the same formula as the calculator above: amount × (15% ÷ 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 | $12.33 | $24.66 | $36.99 |
| $5,000.00 | $61.64 | $123.29 | $184.93 |
| $10,000.00 | $123.29 | $246.58 | $369.86 |
What South Dakota law says about invoice interest
Unless there is an express contract in writing fixing a different rate or the interest rate clearly appears on the bill, statement, or invoice, interest is payable on all moneys at the Category F rate of interest as established in § 54-3-16 after they become due [...] Any interest rate appearing on a bill, statement, or invoice may not exceed eighteen percent.
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 South Dakota — written B2B contracts
Conditional cap 18% if the rate only appears on the bill, statement, or invoice; no cap if fixed by written agreement.
A rate fixed by written agreement — a document in physical or electronic form in which the parties have demonstrated their agreement to the rate — has no statutory maximum under SDCL 54-3-1.1. But that section applies only 'unless a maximum interest rate or charge is specifically established elsewhere in the code,' and SDCL 54-3-5 establishes one: a rate that merely appears on a bill, statement, or invoice may not exceed eighteen percent. Unilaterally printing 1.5%/month on an invoice is therefore the capped path, not the uncapped one.
Basis: SDCL 54-3-1.1; 54-3-5. 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 South Dakota's landlord-tenant law. South Dakota: SDCL chapters 43-32 and 21-16 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
South Dakota'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.
South Dakota late fee FAQ
Is there a legal limit on rent late fees in South Dakota?
South Dakota's codified laws on leases of real property (SDCL 43-32) and on eviction actions (21-16) contain no late fee provision, so they neither cap a late rent fee nor give a grace period. Read in full for this check: South Dakota Codified Laws, chapter 43-32 (Lease of Real Property) and chapter 21-16 (Forcible Entry and Detainer), 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 South Dakota?
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 South Dakota?
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: 15%. Category F default rate when no written rate is fixed, from the day the balance is due/ascertained. Statute: SDCL 54-3-5, 54-3-16, 54-3-1.1, verified 2026-08-21. Consumer and rent debts follow separate laws.
What is the maximum late fee on a B2B invoice in South Dakota?
For a written B2B contract: No cap on a rate fixed by written agreement (SDCL 54-3-1.1) — unless a maximum is set elsewhere in the code, and one is: a rate that only appears on a bill, statement, or invoice may not exceed 18%. Basis: SDCL 54-3-1.1; 54-3-5. 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 South Dakota?
The statutory default rate of 15%. Category F default rate when no written rate is fixed, from the day the balance is due/ascertained. Statute: SDCL 54-3-5, 54-3-16, 54-3-1.1 (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 — South Dakota'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 South Dakota'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.