Understand your IRS transcript and letters
What your IRS transcript code or letter means — and exactly what to do next.
Free tools
Lookups and calculators built for taxpayers and tax preparers.
Transcript Code Lookup
What 150, 570, 846, 971 and other transcript codes mean for your refund.
IRS Letter Lookup
CP53E, 147C, CP2000, CP59, CP504, LT11 and 70+ more — what they mean and what to do.
IRS Penalty & Interest Calculator
Estimate IRS failure-to-file and failure-to-pay penalties plus daily-compounded interest on unpaid tax.…
IRS Payment Plan Calculator
See how many months an IRS installment agreement takes and how much interest and penalty you'll pay.…
IRS Cycle Code Decoder
Decode the 8-digit cycle code on your IRS transcript: processing year, week and daily or weekly posting.…
IRS Mileage Calculator 2026
Calculate your 2026 mileage deduction or reimbursement with both 2026 business rates (72.5¢ Jan–Jun, 76¢ …
No Tax on Overtime Calculator
Estimate your qualified overtime deduction: up to $12,500 ($25,000 joint), reduced above $150,000 / $300,…
How it works
- Search the code from your transcript or letter.
- Read the plain-English meaning and why it happened.
- Follow the steps — respond, pay, or simply wait.