
IRS TIN Matching for Bookkeepers: Free December Check That Prevents B-Notices
Run the IRS TIN Matching Program every December. Catch vendor mismatches before you file and skip the CP2100 B-Notice headache in spring.

Run the IRS TIN Matching Program every December. Catch vendor mismatches before you file and skip the CP2100 B-Notice headache in spring.

Backup withholding withholds 24% from vendor payments when a W-9 is missing or TIN mismatch unresolved. §3406 rules for 2026.

NEC for services, MISC for rent and royalties. Here's the 2026 decision tree for every vendor type.

OBBBA reverted the 1099-K threshold to $20,000 + 200 transactions. What bookkeepers must track for Stripe, PayPal, and Venmo payments.

1099-NEC shifts to Feb 2, 2026. MISC IRS copy March 2 paper or March 31 e-file. Penalties $60-$680/form. Full 2026 deadline matrix.

Wrong TIN, wrong amount, or wrong recipient on a filed 1099? Here's the exact correction process for paper and electronic filers.

Foreign vendors never go on a 1099. Here's the correct form chain: W-8BEN, Form 1042-S, §1441 withholding, and a March 15 deadline.