Filing taxes late costs 5% of your unpaid tax bill per month, up to 25%. But if you’re owed a refund, there’s no penalty at all — file whenever you can (within 3 years). The key distinction is whether you owe or are owed.
Penalty Summary
| Situation | Penalty |
|---|---|
| Filed late, owe taxes | 5% of unpaid tax per month (max 25%) |
| Filed late, owed a refund | $0 — no penalty |
| Filed 60+ days late, owe taxes | Minimum $510 or 100% of tax owed |
| Filed late AND paid late | Both penalties apply (combined max 47.5% + interest) |
| Filed extension, paid on time | $0 — no penalty |
| Filed extension, paid late | 0.5% of unpaid tax per month (failure-to-pay only) |
Failure-to-File vs. Failure-to-Pay
| Penalty Type | Rate | Maximum | Triggered By |
|---|---|---|---|
| Failure to file | 5% per month | 25% | Not filing by due date |
| Failure to pay | 0.5% per month | 25% | Not paying by due date |
| Both together | 5% per month (combined) | 47.5% total | Filing and paying late |
| Interest | ~8% annually (2026) | No maximum | Compounds daily on unpaid balance |
Filing late is 10x more expensive than paying late. If you can’t pay, file anyway — the failure-to-file penalty is 5% vs. only 0.5% for failure to pay.
Timeline: Cost of Filing Late
Example: $5,000 tax owed, filed 6 months late:
| Month Late | Failure-to-File Penalty | Failure-to-Pay Penalty | Interest (~8%) | Cumulative Cost |
|---|---|---|---|---|
| 1 month | $250 | $25 | $33 | $308 |
| 2 months | $500 | $50 | $67 | $617 |
| 3 months | $750 | $75 | $100 | $925 |
| 4 months | $1,000 | $100 | $133 | $1,233 |
| 5 months | $1,250 | $125 | $167 | $1,542 |
| 6 months | $1,250 (maxed) | $150 | $200 | $1,600 |
| Total | $1,250 | $150 | $200 | $1,600 |
A $5,000 tax bill becomes $6,600 after 6 months of filing and paying late.
What to Do If You’ve Already Missed the Deadline
| Step | Action | Why |
|---|---|---|
| 1 | File as soon as possible | Every month you wait costs 5% more |
| 2 | Pay as much as you can | Reduces the balance penalties and interest apply to |
| 3 | Request a payment plan | IRS offers installment agreements (Form 9465) |
| 4 | Request penalty abatement | First-time penalty abatement (FTA) if you have clean history |
| 5 | Consider an Offer in Compromise | If you truly can’t pay the full amount |
First-Time Penalty Abatement
| Requirement | Details |
|---|---|
| Clean filing history | Filed all required returns for the past 3 years |
| Clean payment history | No penalties in the past 3 years |
| Current on payments | Current tax year is filed and paid (or on a payment plan) |
| How to request | Call the IRS at 1-800-829-1040 or include with written response to penalty notice |
| What’s waived | Failure-to-file and failure-to-pay penalties (interest is NOT waived) |
First-time penalty abatement can save you hundreds or thousands. Always ask if you qualify.
IRS Payment Plans
| Plan Type | Balance Owed | Monthly Fee | Details |
|---|---|---|---|
| Short-term (under 180 days) | Under $100,000 | $0 | Pay in full within 180 days |
| Long-term (direct debit) | Under $50,000 | $22 setup | Monthly auto-payments |
| Long-term (other payment) | Under $50,000 | $69 setup | Monthly payments by check/card |
| Low-income adjustment | Under $50,000 | $0 or reduced | If income below 250% FPL |
The Bottom Line
If you owe taxes, file on time even if you can’t pay — the filing penalty is 10x worse than the payment penalty. If you’re getting a refund, file whenever you can (but within 3 years). If you’ve already missed the deadline, file immediately, pay what you can, and request first-time penalty abatement.
Related: What Happens If You Don’t File Taxes? | What Happens If You Can’t Pay Your Taxes?
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