Year-End Payroll Checklist: W-2s, P60s and Final Pay Runs
December payroll is where a year of small payroll mistakes comes home to roost. A wrong address, a missed bonus, a benefit nobody coded properly: each one turns into a corrected form, an annoyed employee or a late filing in January. This checklist walks you through the final pay runs of the calendar year and the forms that follow, for US employers preparing W-2s and UK employers who will issue P60s later in the spring.
Key takeaways
- Treat year-end payroll as three jobs: clean the data in November, run accurate final pay runs in December, then file forms in January.
- In the US, W-2s are due to employees and the government by 31 January, so employee details and year-to-date totals need to be right before the holidays.
- In the UK, December is a calendar year-end, not the tax year end. P60s follow by 31 May and P11Ds by 6 July.
- Holiday pay dates, bonuses and leavers cause most December errors. Plan them on a calendar before you run anything.
- A short reconciliation of payroll reports against your bank and accounts catches most problems while they are still cheap to fix.
If you run payroll for a small team, you probably do not think about it much for eleven months of the year. Your software calculates, the money goes out, and life moves on. Then December arrives with early pay dates, bonuses, people leaving, people joining in January, and a stack of year-end forms that all depend on what happened in the previous twelve months.
The good news is that year-end payroll is predictable. This guide covers the US and the UK side by side, because the timing is very different in each country, and a lot of small businesses now have people in both.
One quick note before we start: this is general information about payroll processes, not tax, legal or employment advice. Rules change and vary by state and country, so check the official guidance and talk to your accountant or payroll provider about your own situation.
Why year-end payroll needs its own plan
A normal pay run only has to be right for one period. The last pay runs of the year have to be right for the whole year, because they feed every annual form you produce. If an employee's address changed in July and nobody updated it, the W-2 goes to the wrong house. If a benefit was never coded as taxable, the annual totals are wrong and you may need corrected forms later.
December also squeezes the calendar. Bank holidays and earlier provider cut-offs mean you often approve payroll days sooner than usual.
US and UK timing at a glance
The biggest difference between the two countries is when the "year" ends for payroll purposes:
- United States: payroll years follow the calendar year. The final December pay date decides which year wages belong to, and W-2s for the year are due to employees and the government by 31 January.
- United Kingdom: the tax year ends on 5 April. A December "year-end payroll" is really about Christmas pay dates and the final runs of the calendar year. P60s go to employees by 31 May, and P11Ds for benefits are due by 6 July.
If you employ in both countries, keep two separate calendars so the UK spring deadlines do not get lost in the US January rush.
Step 1: Clean your employee data in November
Most year-end form errors are data errors, not calculation errors. November is the right time to fix them, while you still have regular pay runs to correct anything that turns up.
- Confirm names and ID numbers. Names should match official records, and Social Security numbers (US) or National Insurance numbers (UK) should be complete and correct. A mismatch can trigger notices later.
- Check home addresses. Ask every employee to confirm their address in your payroll system or HR portal. Former employees count too, because their forms still need to reach them.
- Review tax setup. Look for missing or outdated withholding forms (US) or tax code issues (UK). Do not change anything an employee has not asked for, but flag anything that looks wrong.
- Find your leavers. List everyone who left during the year, with their final pay date and whether they received all final pay, including unused leave where that applies.
- List benefits and extras. Health cover, company cars, phones, gym memberships, gift cards and similar perks may need to be reported or taxed. Make a list now so nothing gets missed.
Pro tip
Send one short email asking every employee to log in and check their address, legal name and bank details by a fixed date in November. Most people will do it in under two minutes, and it saves you chasing returned forms in February.
Step 2: Plan the December pay calendar
Before you run a single December payroll, put every date on one page. This is where small businesses most often get caught out, because public holidays and bank processing times move the real deadlines forward.
What to put on the calendar
- Each regular pay date in December and early January.
- Bank holidays in each country where you pay people.
- Your payroll provider's cut-off for each run, including any earlier holiday cut-offs.
- The date you need timesheets, overtime and commission figures from managers.
- Who approves payroll if you or your usual approver are away.
- Any one-off payments, such as bonuses or final pay for leavers.
The pay date decides the year
In the US, wages generally belong to the year in which they are paid, not the year in which the work was done. So if you move a pay date from early January into late December, those wages land on this year's W-2 instead of next year's. That can be fine, but it should be a deliberate choice, not an accident caused by a holiday shuffle. If you are unsure, ask your payroll provider or accountant how a moved pay date affects your forms.
In the UK, an early Christmas payday is common and usually simple. The key is to report it correctly with the right payment date and make sure staff know they will wait longer for the January pay.
Common mistake
Paying staff early for Christmas and forgetting to tell them. An early December payday can leave a five-week gap until the next one. Send a clear note with both dates so nobody is caught short in January.
Step 3: Run the final pay runs of the year
With clean data and a clear calendar, the December runs themselves are mostly routine. The extra work is in the one-off items.
Bonuses and one-off payments
Bonuses are usually taxed as wages and need to go through payroll, not as a separate bank transfer. Decide early whether they will be paid with a regular run or a separate run, because that affects how withholding is calculated in some systems. If you are planning holiday bonuses, sort the amounts and approvals in November; the details of bonus planning are a topic of their own.
Leavers and new starters
Anyone leaving in December needs their final pay calculated and processed on time. Anyone starting in January needs their setup done before the first run, which may happen while you are on leave. Prepare both lists now.
Step 4: Reconcile before you file
Reconciliation sounds intimidating, but for a small employer it is mostly a comparison exercise. You are checking that three sets of numbers agree: what your payroll reports say, what left your bank account, and what your accounting records show.
- Pull a year-to-date payroll summary. Most payroll systems have one report showing gross pay, taxes, deductions and net pay for each employee.
- Compare net pay to your bank. Total net pay should match the wage payments that left your account during the year.
- Compare tax payments. The taxes your payroll system says you owed should match what you actually paid to the tax authorities.
- Check quarterly or periodic filings. In the US, the totals across your quarterly payroll returns should line up with the annual figures. In the UK, your regular submissions to HMRC should match your payroll records.
- Investigate every difference. Small gaps often come from a manual payment, a reversed transfer or a payment dated in the wrong period. Write down what you find and how you fixed it.
A year-end payroll reconciliation template
Copy this into a spreadsheet and fill in one row per check. The figures below are made-up examples for illustration only.
| Check | Payroll report | Bank or filing | Difference | Explanation and fix |
|---|---|---|---|---|
| Total net pay (example) | $412,300 | $412,300 | $0 | Matches |
| Employer taxes paid (example) | $38,950 | $38,700 | $250 | Late payment cleared in January; confirm with provider |
| Bonus run (example) | $12,000 | $12,000 | $0 | Paid in December run, on this year's forms |
Example
Imagine Marco runs a small coffee roastery with nine staff in the US and two in the UK. In mid-November he sends an address check email, finds two people who moved, and updates them. He maps December pay dates and spots that one falls on a bank holiday, so he moves it a day earlier and tells the team. In early January he runs his reconciliation and finds a $250 gap in employer taxes, which turns out to be a payment that cleared late. Because he found it before filing, his W-2s go out correct on the first try, and his UK team simply gets their P60s in the spring as usual. (Marco and his numbers are made up for illustration.)
Step 5: Produce and send the year-end forms
Once the numbers agree, the forms are mostly a matter of generating, checking and sending them on time.
US: W-2s and related filings
Your payroll provider will usually generate W-2s from the year's data. Before you approve them, spot-check a few employees: one regular salaried person, one hourly person with overtime, one person who left during the year and anyone with unusual benefits. Then make sure every employee receives their copy by 31 January, by mail or electronically if they have consented to electronic delivery. If you also pay contractors, their 1099-NEC forms share the same 31 January deadline, so plan both together.
UK: P60s and P11Ds
Because the UK tax year ends on 5 April, P60s are not a December job. They go to every employee still on your payroll at the tax year end, by 31 May. P11Ds, which report certain benefits in kind such as company cars, are due by 6 July unless you payroll those benefits instead. Use December to make sure your benefit records are complete, so those spring deadlines are easy.
Tools that help
Payroll services with year-end filing, such as Gusto, ADP, QuickBooks Payroll, Xero Payroll and BrightPay (UK), can generate and file many of these forms for you. They differ in which countries, states and forms they handle, so check current features, pricing and privacy policies, and confirm exactly which filings are included in your plan.
Your year-end payroll checklist
- Ask every employee to confirm name, address and bank details in November
- Check ID numbers and tax setup for every current and former employee
- List leavers, new starters, bonuses and taxable benefits
- Map December and January pay dates, holidays and provider cut-offs
- Tell staff about any early or moved pay dates in writing
- Run a year-to-date reconciliation against your bank and filings
- Spot-check draft W-2s before approval and send them by 31 January
- Note the UK dates for P60s (31 May) and P11Ds (6 July)
- Save your notes and set a reminder for next November
Frequently asked questions
Does a December pay date in the UK change the tax year totals?
No, not in the way it does in the US. The UK tax year runs to 5 April, so a December pay date simply falls in the middle of the tax year. It still needs to be reported correctly with the right payment date, but P60s are not affected until the tax year closes.
What if I find a mistake after W-2s have gone out?
Corrections are possible. In the US, there is a separate corrected form process for W-2s. Fix the payroll records first, then talk to your payroll provider or accountant about issuing a correction and updating any related filings.
Do I need to issue forms to employees who left during the year?
Yes. In the US, anyone you paid wages to during the year should get a W-2, including leavers. In the UK, people who left before the tax year end received a P45 when they left rather than a P60.
Related reading
The bottom line
Year-end payroll goes smoothly when you split it into stages: clean your data in November, plan and run your December pay calendar carefully, reconcile your totals, and then produce the forms. US employers have a tight 31 January deadline for W-2s, while UK employers have until the spring for P60s and P11Ds, but both benefit from getting the records right before the holidays.
Block out an hour this month to start the checklist. A little attention now means fewer corrections, fewer worried employees, and a much quieter January.
