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Late Fee Calculator

Rebuild both the timing and the fee formula from your records. Model calendar or business-day waiting periods, due-date counting and holiday exclusions, then choose the correct percentage base, floor, daily charge or maximum cap and compare the result with your ledger and verified state guidance.

Calendar + businessday-counting modes
Floor + capgreater/lower-of support
21 statesverified source links
Use the formula from your own documents.

Enter only the components stated in the lease, addendum, fee disclosure or company notice. State selection opens a separate source check; it never silently replaces your lease formula.

Fee formula from your documents

Enter one or more components

Verified presets are opt-in and timing-only. No percentage base, minimum, cap or dollar amount is silently preloaded.

Enter the dates, waiting period and fee formula.

Provide the due date, payment date, an explicit waiting-period value, and at least one fixed, percentage or daily component. If a percentage is used, also select and enter its percentage base.

What this calculator does

Check the timing before checking the formula

A five-day rule can mean different things. One source may count calendar days after the due date, another may count the due date as day one, and another may use business days that exclude weekends and holidays. The calculator keeps those choices explicit instead of treating every “five-day grace period” as the same calendar.

Verified late-fee source layers currently cover 21 state frameworks.

California, Colorado, Connecticut, Delaware, Hawaii, Iowa, Maine, Massachusetts, Maryland, Minnesota, Nevada, New Jersey, New Mexico, New York, North Carolina, Oregon, Tennessee, Texas, Utah, Virginia, Washington have dedicated late-fee source guidance. Their timing, notice, eligibility, calculation-base and amount rules differ materially, so the calculator keeps arithmetic and legal-source review separate.

Compare Late Fee Rules by State →

Business days and calendar days are not interchangeable

New Jersey’s qualified-tenant protection uses five business days and excludes Saturdays, Sundays and State or federal holidays. Tennessee URLTA uses a different structure: the due date is day one of a five-day grace period, with a special next-business-day protection when the fifth day falls on Sunday or a legal holiday. The calculator now supports both patterns without silently applying either one to another state.

Verified timing presets are opt-in

Where a source-backed timing pattern can be encoded safely, the selected state may show an “Apply verified timing setup” button. It fills only the day-counting controls. It does not establish that the rule applies to your tenancy, does not fill a fee amount, and does not replace eligibility, county-coverage, lease or effective-date checks.

Four formula workflows this tool can separate

  • Additive: a fixed component plus a percentage and/or daily amount.
  • Greater-of / minimum floor: calculate the formula, then apply a stated minimum. A dollar floor belongs in Minimum fee / floor, not as an additive component.
  • Lower-of / maximum cap: calculate the formula, then apply the stated maximum cap.
  • Derived maximum cap: some rules compare two candidate ceilings. Colorado, for example, uses the greater of $50 or 5% of the past-due rent payment as the ceiling; calculate the two candidates first and enter the larger result as the cap.

Keep the percentage base state-specific

Partial payments, credits and housing assistance can change the relevant balance. Some state rules use periodic rent, others unpaid or overdue rent, rent due or a tenant-paid share. Hawaii uses the amount of rent due for its 8% ceiling; New Mexico excludes deposits, additional fees and utilities from its rent base; Maryland uses unpaid rent due under its ordinary non-weekly rule.

Check agreement, coverage and eligibility rules too

Correct calendar math is only one layer. Hawaii has an agreement/renewal-date applicability checkpoint, Tennessee URLTA requires a county-coverage check, and New Jersey’s five-business-day rule applies only to defined qualified tenants when rent is due on the first of the month. Preserve the records needed to prove the threshold facts before relying on a state timing result.

Documents worth comparing

  • Signed lease and any late-fee addendum.
  • Rent due date and the exact wording of any waiting or grace period.
  • Holiday dates relevant to a business-day or legal-holiday rule.
  • Lease start date and renewal history when a state rule has an applicability date.
  • Eligibility or program records when the protection is category-specific.
  • Payment confirmations showing full and partial payments.
  • Resident ledger showing the balance immediately before the late fee posted.
  • Rent credits and housing-assistance records when they affect the calculation.

If the amount does not match

  1. Confirm whether the waiting period uses calendar days or business days.
  2. Confirm whether counting starts after the due date or includes it as day one.
  3. Enter relevant holiday dates if the rule excludes or adjusts for them.
  4. Confirm whether the percentage base is periodic rent, rent due or the remaining overdue balance.
  5. Remove non-rent items if the state rule excludes them from the base.
  6. Check whether a dollar amount is additive, a minimum floor or a maximum cap.
  7. Check whether a partial, returned or assistance payment changed the calculation.
  8. Open the verified state guide and confirm coverage, eligibility and effective-date conditions.
Arithmetic tool only. A calculated amount or date is not a legal conclusion. State/local law and the exact lease can limit, prohibit or condition late fees, timing, calculation bases, floors, caps and daily charges.