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Invoice Late Fee Calculator

Enter your invoice amount, due date, and fee structure to see exactly what you're owed today — plus 30/60/90-day projections and copy-paste contract language.

Where this fits

📈 Investing & WealthGoing 1099Trading IncomeFreelancersTraders

This tool lives inside Going 1099 + Trading Income and is most useful for freelancers and traders.

401(k) Limit 2024$23,000
Roth IRA Limit$7,000
S&P 500 Avg Return~10%/yr
15d past due — fees accruing
Late fee accrued
$24.64
Total now owed
$5,024.64
Days past due
15d
Daily accrual
$2.46/day
Fee type

Compound interest

Compounds monthly

APR: 18.00% — Most US states cap commercial late fees at 18–24% APR. Late fees are only enforceable if stated in the original contract.

Fee milestones (after due date)

30 days$61.60
60 days$135.51
90 days$209.43

Invoice Summary

Original invoice$5,000
Days since issued45d
Days past due15d
Grace period5d
Fee-accruing days10d
Late fee accrued$24.64
Total owed$5,024.64
Accruing $2.46/day

Legal notes:

  • Only enforceable if in original contract
  • Most states cap at 1.5–2%/month (18–24% APR)
  • CA, TX, NY have additional usury restrictions
  • Grace periods are common practice (5–15 days)
1

Days overdue

Days past due = Today − Due date

= 15 days past due

5 day grace period → 10 fee-accruing days

2

Monthly percentage fee

Fee = Invoice × (rate/100) × (days / 30.44)

= $5,000 × 1.50%/mo × 0.33 months

30.44 avg days/month (365/12). Simple interest.

3

Late fee accrued

Late fee accrued = calculated fee amount

= $24.64

4

Total now owed

Total owed = Invoice amount + Late fee accrued

= $5,000 + $24.64 = $5,024.64

5

Daily accrual rate

Daily accrual = Invoice × rate/100 / 30.44 = $5,000 × 1.50%/100 / 30.44

= $2.46/day

That's $73.92/month at current rate

6

Effective annual rate (APR)

APR = rate/month × 12 = 1.50% × 12

= 18.00% per year

Most US states cap commercial late fees at 18–24% APR. Check local laws before applying.

UCC §2-718; state usury laws vary

7

30/60/90-day projections

Milestones = fee calculated at 30, 60, 90 days past due (after grace period)

= 30d: $61.60 | 60d: $135.51 | 90d: $209.43

These assume the same invoice amount and fee structure throughout.

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