# Backup Withholding for 1099-NEC

Backup withholding is the IRS's enforcement tool for ensuring contractors report their income. When a payer can't verify the contractor's TIN, the payer must withhold 24% of every payment and remit it to the IRS. This file explains when, how, and how to recover from common errors.

## When backup withholding applies

Per IRC §3406, the payer must apply 24% backup withholding when **any** of these conditions exist:

1. **No TIN provided** — the payee hasn't returned a W-9, or returned a W-9 without a TIN
2. **Wrong TIN format** — TIN provided isn't a valid SSN / ITIN / EIN format (e.g., 8 digits instead of 9, or includes letters)
3. **TIN mismatch (B-Notice)** — IRS notifies payer that the recipient's TIN doesn't match IRS records (CP2100 or CP2100A notice received by payer)
4. **Under-reporting (C-Notice)** — IRS notifies payer that recipient under-reported interest / dividend income (rare for 1099-NEC contractors)
5. **W-9 not certified** — recipient checked W-9 Part II box stating they ARE subject to backup withholding (very rare; means recipient has been instructed by IRS)

## Withholding rate

**24%** of each payment (IRC §3406(a)). This is the rate effective 2018 onward (TCJA changed it from 28% to 24%).

The rate applies to the gross payment, not the net. If payer is paying $1,000 for services with backup withholding active:

- Gross payment: $1,000
- Backup withholding: $1,000 × 24% = $240
- Net to recipient: $760

## When backup withholding starts and stops

### Starts

For the **no-TIN / wrong-TIN-format** case: immediately on the first payment after the W-9 issue is identified.

For the **B-Notice (TIN mismatch)** case: payer receives CP2100 or CP2100A from the IRS, promptly sends a B-Notice (first or second) to the recipient, and:
- **First B-Notice**: the payer may begin withholding right away and **must** withhold on any reportable payment made more than **30 business days after the payer received the IRS notice**, unless a certified Form W-9 has arrived; stop within 30 days after receiving the certified W-9 (Pub. 1099 (2026), part N; Reg. §31.3406(d)-5; Pub. 1281).
- **Second B-Notice** (received from IRS within 3 calendar years for the same recipient): payer cannot rely on a new W-9; recipient must provide IRS Letter 147C (verification of TIN from IRS) or SSA Form SSA-7028. Failure → backup withholding starts immediately and continues until the verification is received.

### Stops

Backup withholding stops when:
- Valid TIN is received and verified (e.g., via TIN Matching service confirming match)
- The IRS rescinds the C-Notice
- Recipient certifies on W-9 Part II that they are no longer subject to backup withholding

## Payer obligations

When backup withholding is active, the payer must:

1. **Withhold 24% from each payment** to the affected recipient
2. **Deposit the withheld amount with the IRS** by EFT (EFTPS, IRS Direct Pay, or business tax account), on the Form 945 deposit schedule (monthly or semi-weekly; the Form 945 lookback period is the second preceding calendar year — Pub. 15 (2026), section 11)
3. **File Form 945** (Annual Return of Withheld Federal Income Tax) by January 31 of the following year (February 1, 2027 for 2026), reporting all backup withholding for the year on line 2. Form 945 is separate from Form 941 (which is for employee withholding).
4. **Issue Form 1099-NEC** to each affected recipient with Box 1a (Box 1 for 2025) = total gross payments, Box 4 = total backup withholding amount, regardless of whether the gross crosses the $2,000 threshold (backup withholding requires a 1099-NEC).
5. **File Copy A with IRS** along with all other 1099-NECs.

## Recipient consequences

The recipient who had backup withholding applied:

- Receives 1099-NEC with Box 4 > 0
- Reports the gross income (Box 1) on Schedule C or Schedule 1
- Claims credit for the withheld amount on **Form 1040 Line 25b** (federal income tax withheld from Form(s) 1099; 2025 Form 1040)
- The withheld amount counts against the recipient's federal income tax liability — same as if it were W-2 withholding

Backup withholding is **not** a penalty to the recipient (the money is credited against their actual tax). It's a cash-flow inconvenience and a signal to the recipient to fix the underlying TIN issue.

## How to avoid backup withholding (payer's playbook)

1. **Get a W-9 BEFORE the first payment**. Don't pay until W-9 is on file with TIN. (After P.L. 119-21, backup withholding on contractor payments generally starts once the payee's annual total reaches the $2,000 reporting amount, or if the payee was reportable or backup-withheld in the prior year — IRC §3406(b)(6); Pub. 1099 (2026), What's New.)
2. **Verify the W-9 via TIN Matching**. The IRS offers a free TIN Matching service through e-Services for payers who file 1099s. Submit the recipient's name + TIN and get a match / no-match response in real time.
3. **Apply backup withholding immediately** if the W-9 is missing, incomplete, or fails TIN matching. The payer is liable for the 24% even if they didn't withhold (i.e., if no W-9 was on file and payer paid full amount, payer owes the IRS the 24% out of payer's own pocket).
4. **Document everything**. Keep W-9s, TIN matching responses, B-Notices, and recipient correspondence. The B-Notice process has strict timelines and the documentation is the payer's defense.

## How to fix backup withholding errors

### Error: payer didn't withhold but should have

Payer is liable for the 24% withholding amount. Pay it via Form 945 (or Form 945-X to amend a prior-year filing). The recipient was paid 100% gross — the payer eats the 24% as an out-of-pocket cost unless they can recover from the recipient.

### Error: payer withheld too much

Refund to the recipient via reduced future payments, or issue a refund and adjust Form 945 (next-year filing) to claim a credit. Don't try to amend 1099-NEC unless the year is still open — issue a Corrected 1099-NEC if amount changed.

### Error: payer withheld for the wrong reason (e.g., misunderstood the W-9)

If withholding was applied but shouldn't have been, file Corrected 1099-NEC reducing Box 4. Refund recipient. Adjust Form 945 in the next filing.

## Example: recipient with no W-9 history

Payer Acme Corp pays freelance writer Jamie $5,000 for an article in 2026. Jamie never returned a W-9 despite multiple requests.

- Gross paid to Jamie: $5,000
- Backup withholding (24%): $1,200
- Net to Jamie: $3,800
- Acme deposits $1,200 with IRS via EFTPS
- Acme files Form 945 by February 1, 2027 (January 31, 2027 is a Sunday), reporting $1,200 backup withholding on line 2
- Acme issues 1099-NEC to Jamie: Box 1a = $5,000, Box 4 = $1,200
- Jamie reports $5,000 on Schedule C (or Schedule 1 if not a business), claims $1,200 on the Form 1040 line for Form 1099 withholding (line 25b on the 2025 form)

If Jamie's actual federal income tax for 2026 is, say, $900 (low-income year), the $1,200 backup withholding generates a $300 refund.

## Form 945 mechanics

Form 945 is the annual reconciliation for backup withholding (and for non-payroll federal income tax withholding more generally — like withholding on pension distributions, gambling winnings, etc.).

- Form 945 Line 1: federal income tax withheld from pensions, annuities, IRAs, gambling winnings, etc.
- Form 945 Line 2: backup withholding (the Box 4 amounts on 1099-NEC and other 1099s)
- Line 3: total taxes (Line 1 + Line 2)
- Line 4: total deposits; Line 5: balance due; Lines 6a–6e: overpayment, refund/apply choice, direct deposit
- Line 7: monthly summary of tax liability (monthly depositors only; semi-weekly depositors use Form 945-A)

(2025 Form 945.) Form 945 is due **January 31** following the calendar year. If all deposits were made on time, the deadline extends to **February 10**.

Source: https://www.irs.gov/forms-pubs/about-form-945

## State backup withholding

Some states have their own withholding regimes (for example, California nonresident withholding reported on FTB Form 592). This skill does not carry verified state rates: check the state's revenue department for current rules.