Name: OpenAccountants MCP Server
Author: OpenAccountants

openaccountants/skills/uk-payments-on-account.md

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1	---
2	name: uk-payments-on-account
3	description: >
4	Use this skill whenever asked about UK Payments on Account (POA) for Self Assessment taxpayers. Trigger on phrases like "payments on account", "POA", "January payment", "July payment", "balancing payment", "SA303", "claim to reduce", "reduce payments on account", "do I need to make payments on account", "POA threshold", "tax underpayment", or any question about advance income tax payments under UK Self Assessment. Covers the two-payment schedule (31 January / 31 July), the GBP 1,000 threshold, the 80% PAYE test, balancing payment mechanics, SA303 claim to reduce, excluded items (Class 2 NIC, student loan, CGT), interest on late payments, and interaction with tax codes. ALWAYS read this skill before touching any UK POA work.
5	version: 2.0
6	jurisdiction: GB
7	tax_year: 2024-25
8	category: international
9	depends_on:
10	- income-tax-workflow-base
11	---
12
13	# UK Payments on Account (POA) -- Self Assessment Skill v2.0
14
15	## Section 1 -- Quick reference
16
17	\| Field \| Value \|
18	\|---\|---\|
19	\| Country \| United Kingdom \|
20	\| Tax \| Income tax advance payments (Payments on Account / POA) \|
21	\| Primary legislation \| Taxes Management Act 1970 (TMA 1970), Section 59A \|
22	\| Supporting legislation \| Income Tax (Pay As You Earn) Regulations 2003; Finance Act 2024; TMA 1970 s59B, s86 \|
23	\| Authority \| HM Revenue & Customs (HMRC) \|
24	\| Portal \| HMRC Self Assessment Online \|
25	\| Currency \| GBP only \|
26	\| Payment schedule \| Two POAs: 31 January (in tax year) + 31 July (after tax year); balancing payment 31 January following \|
27	\| Threshold \| SA balance >= GBP 1,000 AND PAYE < 80% of total tax \|
28	\| Excluded items \| Class 2 NIC, student loan, postgraduate loan, CGT, marriage allowance \|
29	\| Contributor \| Open Accountants Community \|
30	\| Validated by \| Pending -- requires sign-off by UK-qualified accountant (ACA/ACCA/CTA) \|
31	\| Validation date \| Pending \|
32
33	Payment schedule summary (tax year 2024/25):
34
35	\| Payment \| Due date \| Amount \|
36	\|---\|---\|---\|
37	\| 1st POA \| 31 January 2025 \| 50% of prior year SA balance \|
38	\| 2nd POA \| 31 July 2025 \| 50% of prior year SA balance \|
39	\| Balancing payment \| 31 January 2026 \| Actual liability minus POAs paid \|
40
41	Conservative defaults:
42
43	\| Ambiguity \| Default \|
44	\|---\|---\|
45	\| SA balance uncertain \| Pay full POA -- do not reduce without SA303 \|
46	\| Prior year return not yet filed \| Use last known SA balance; flag for reviewer \|
47	\| CGT included in SA balance \| Exclude CGT before computing POA \|
48	\| Student loan included \| Exclude before computing POA \|
49	\| HMRC coding out unclear \| Verify coded amount removed from SA balance \|
50
51	---
52
53	## Section 2 -- Required inputs and refusal catalogue
54
55	### Required inputs
56
57	Minimum viable -- prior year Self Assessment tax return showing total tax/Class 4 NIC liability, tax deducted at source, and any excluded items.
58
59	Recommended -- the HMRC statement or tax calculation showing the SA balance, any SA303 filing history, current year income expectations.
60
61	Ideal -- the full SA302 tax calculation from HMRC, prior year payment history, and any coding adjustment letters.
62
63	Refusal policy if minimum is missing -- SOFT WARN. If the prior year SA balance is unknown, flag that POA computation is unreliable and direct the client to obtain their SA302 from HMRC.
64
65	### Refusal catalogue
66
67	R-UK-POA-1 -- Partnerships with complex profit-sharing. Trigger: client is in a partnership with non-standard profit-sharing ratios. Message: "Partnership POA allocation requires partner-level analysis. Please escalate to a qualified accountant."
68
69	R-UK-POA-2 -- Non-resident POA obligations. Trigger: client is non-UK resident. Message: "Non-resident Self Assessment has different POA rules. Please escalate to a qualified accountant."
70
71	R-UK-POA-3 -- Trust POA. Trigger: client asks about trust payments on account. Message: "Trust estimated tax is outside the scope of this skill."
72
73	---
74
75	## Section 3 -- Payment pattern library
76
77	This is the deterministic pre-classifier for bank statement transactions. When a debit matches a pattern below, classify it as a POA payment.
78
79	### 3.1 HMRC Self Assessment debits
80
81	\| Pattern \| Treatment \| Notes \|
82	\|---\|---\|---\|
83	\| HMRC, HM REVENUE, HMRC SELF ASSESSMENT \| POA payment \| Match with January/July timing \|
84	\| HMRC CUMBERNAULD, HMRC SHIPLEY \| POA payment \| HMRC processing centres \|
85	\| SELF ASSESSMENT, SA PAYMENT \| POA payment \| Explicit description \|
86	\| PAYMENT ON ACCOUNT, POA \| POA payment \| Self-identified \|
87
88	### 3.2 Timing-based identification
89
90	\| Debit date range \| Likely payment \| Confidence \|
91	\|---\|---\|---\|
92	\| 15 January -- 5 February \| 1st POA + prior year balancing payment \| High if payee is HMRC \|
93	\| 15 July -- 5 August \| 2nd POA \| High if payee is HMRC \|
94	\| Any other date to HMRC SA \| Late payment, voluntary payment, or balancing \| Flag for reviewer \|
95
96	### 3.3 Related but NOT POA payments
97
98	\| Pattern \| Treatment \| Notes \|
99	\|---\|---\|---\|
100	\| HMRC VAT \| EXCLUDE from POA \| VAT payment \|
101	\| HMRC PAYE, HMRC RTI \| EXCLUDE from POA \| Employer PAYE payment \|
102	\| HMRC NIC, CLASS 2 \| EXCLUDE from POA \| NIC direct collection \|
103	\| STUDENT LOAN, SLC \| EXCLUDE from POA \| Student loan repayment \|
104	\| HMRC CGT, CAPITAL GAINS \| EXCLUDE from POA \| CGT payment (separate regime) \|
105	\| HMRC PENALTY, HMRC INTEREST \| EXCLUDE from POA \| Penalty/interest charge \|
106
107	### 3.4 January double-payment identification
108
109	31 January is a critical date where multiple payments coincide. A single large HMRC debit on or near 31 January likely includes:
110	- Balancing payment for the prior year
111	- 1st POA for the current year
112
113	If the total debit is substantially larger than one POA instalment, it is likely the combined payment. Flag for reviewer to split.
114
115	---
116
117	## Section 4 -- Worked examples
118
119	### Example 1 -- Standard POA computation
120
121	Input: Prior year SA balance = GBP 6,000. No excluded items.
122
123	Computation: Each POA = GBP 6,000 / 2 = GBP 3,000.
124
125	\| Payment \| Due date \| Amount \|
126	\|---\|---\|---\|
127	\| 1st POA \| 31 January 2025 \| GBP 3,000 \|
128	\| 2nd POA \| 31 July 2025 \| GBP 3,000 \|
129
130	### Example 2 -- Below GBP 1,000 threshold
131
132	Input: Prior year SA balance = GBP 850.
133
134	Output: Below GBP 1,000 threshold. No POAs required. Full GBP 850 due as balancing payment on 31 January following the tax year.
135
136	### Example 3 -- 80% PAYE test met
137
138	Input: Total tax liability = GBP 20,000. PAYE collected = GBP 17,000. SA balance = GBP 3,000.
139
140	Computation: PAYE% = 17,000 / 20,000 = 85% > 80%. No POA required despite SA balance exceeding GBP 1,000.
141
142	### Example 4 -- Excluded items removed
143
144	Input: Prior year SA: income tax via SA = GBP 4,000, CGT = GBP 3,000, Class 2 NIC = GBP 179.40, student loan = GBP 1,200. Total SA balance = GBP 8,379.40.
145
146	Computation: POA basis = GBP 4,000 only (CGT, Class 2, student loan excluded). Each POA = GBP 2,000.
147
148	### Example 5 -- SA303 reduction
149
150	Input: Standard POA = GBP 5,000 each. Client expects current year SA balance = GBP 3,000. SA303 filed.
151
152	Output: Reduced POA = GBP 1,500 each. If actual liability = GBP 6,000, HMRC charges interest on GBP 3,500 shortfall per instalment from original due dates.
153
154	### Example 6 -- Late payment interest
155
156	Input: 1st POA of GBP 3,000 due 31 January. Paid 15 April (74 days late). Bank of England base rate = 5.25%.
157
158	Computation: Interest rate = 5.25% + 2.5% = 7.75%. Interest = GBP 3,000 x 7.75% / 365 x 74 = GBP 47.12.
159
160	---
161
162	## Section 5 -- Computation rules
163
164	### 5.1 Threshold tests
165
166	POAs are NOT required if EITHER condition is met:
167	- Test 1 (de minimis): Prior year SA balance < GBP 1,000
168	- Test 2 (PAYE dominance): More than 80% of prior year total tax was collected via PAYE/deduction at source
169
170	### 5.2 SA balance definition
171
172	```
173	SA_balance = total_tax_and_class4_NIC - tax_deducted_at_source
174	```
175
176	EXCLUDE from SA balance: Class 2 NIC, student loan repayments, postgraduate loan repayments, capital gains tax, marriage allowance adjustments.
177
178	### 5.3 POA computation
179
180	```
181	each_POA = SA_balance / 2
182	```
183
184	### 5.4 Balancing payment
185
186	```
187	balancing_payment = actual_tax_liability - POA_1 - POA_2
188	```
189
190	The balancing payment includes all excluded items (Class 2 NIC, student loan, postgraduate loan, CGT) -- these are payable in full with the balancing payment.
191
192	### 5.5 SA303 claim to reduce
193
194	A taxpayer expecting lower current year income may file SA303 to reduce POAs to any amount including GBP 0. Risk: if the reduction is too aggressive, HMRC charges interest on the shortfall from the ORIGINAL due dates.
195
196	```
197	reduced_POA_each = estimated_current_year_SA_balance / 2
198	```
199
200	---
201
202	## Section 6 -- Penalties and interest
203
204	### 6.1 Late payment interest
205
206	\| Element \| Rule \|
207	\|---\|---\|
208	\| Rate \| Bank of England base rate + 2.5% (approx. 7.0-7.5% for 2024/25) \|
209	\| Runs from \| Due date of the POA (31 Jan or 31 Jul) \|
210	\| Runs until \| Date of payment \|
211	\| Compounding \| Simple interest (not compound) \|
212	\| Tax deductibility \| NOT tax deductible \|
213
214	### 6.2 Interest computation
215
216	```
217	interest = overdue_amount x (base_rate + 2.5%) / 365 x days_overdue
218	```
219
220	There is no separate penalty for late POA payment -- only interest. A surcharge may apply if the balancing payment is more than 30 days late.
221
222	---
223
224	## Section 7 -- Interaction with tax codes and PAYE
225
226	When HMRC collects SA underpayments via a PAYE tax code (coding out), this reduces the SA balance and therefore reduces POAs for the following year. Maximum coding out is GBP 3,000 for employed taxpayers.
227
228	If HMRC is coding out underpayments, verify whether the coded amount has been correctly removed from the SA balance before computing POAs.
229
230	---
231
232	## Section 8 -- Edge cases
233
234	EC1 -- First year of Self Assessment. No prior year return. No POAs in the first year. All tax due as a single balancing payment. POAs begin from the second year.
235
236	EC2 -- SA303 reduction to zero, then income increases. Balancing payment of full amount due 31 January. HMRC charges interest on the shortfall from each original POA due date.
237
238	EC3 -- Employment plus self-employment. GBP 50,000 PAYE + GBP 15,000 SE. Total tax GBP 18,000, PAYE GBP 14,000. PAYE% = 77.8% < 80%. POAs apply. SA balance = GBP 4,000, each POA = GBP 2,000.
239
240	EC4 -- Prior year SA balance just below GBP 1,000. GBP 980. No POAs required. Full amount due as balancing payment.
241
242	EC5 -- Client stops trading mid-year. May file SA303 to reduce. Overpayment refunded with balancing payment.
243
244	EC6 -- Prior year included one-off capital gain. CGT excluded from POA calculation. If HMRC set POAs at the higher amount, file SA303 to correct.
245
246	EC7 -- Student loan pushed SA balance above GBP 1,000. Student loan excluded. SA balance for POA test = income tax via SA only. If that is below GBP 1,000, no POAs.
247
248	EC8 -- 31 January falls on a weekend. Deadline moves to next working day. No interest for the weekend days.
249
250	EC9 -- HMRC amendment reduces prior year liability. HMRC should adjust POAs automatically. If not, file SA303 referencing the amendment.
251
252	EC10 -- Marriage allowance transfer. Reduces transferor's tax, increases recipient's. POAs based on NET SA balance after marriage allowance.
253
254	---
255
256	## Section 9 -- Self-checks
257
258	Before delivering output, verify:
259
260	- [ ] Both threshold tests checked (GBP 1,000 and 80% PAYE)
261	- [ ] Class 2 NIC, student loan, CGT, postgraduate loan excluded from SA balance
262	- [ ] POA computed as 50% of SA balance (not 50% of total tax)
263	- [ ] 31 January double-payment impact noted (balancing + 1st POA)
264	- [ ] SA303 interest risk flagged if reduction is recommended
265	- [ ] Prior year return status confirmed
266	- [ ] Coding out adjustments verified if applicable
267	- [ ] Weekend/holiday due date adjustments checked
268	- [ ] Balancing payment includes all excluded items
269	- [ ] Output labelled as estimated until prior year return is filed and processed
270
271	---
272
273	## Section 10 -- Test suite
274
275	### Test 1 -- Standard POA computation
276	Input: Prior year SA balance = GBP 6,000.
277	Expected: Each POA = GBP 3,000. 1st due 31 Jan, 2nd due 31 Jul.
278
279	### Test 2 -- Below GBP 1,000 threshold
280	Input: Prior year SA balance = GBP 850.
281	Expected: No POA. Full GBP 850 due as balancing payment.
282
283	### Test 3 -- 80% PAYE test met
284	Input: Total tax = GBP 20,000. PAYE = GBP 17,000. SA balance = GBP 3,000.
285	Expected: PAYE% = 85% > 80%. No POA required.
286
287	### Test 4 -- Excluded items removed
288	Input: Income tax via SA = GBP 4,000, CGT = GBP 3,000, Class 2 = GBP 179.40, student loan = GBP 1,200.
289	Expected: POA basis = GBP 4,000. Each POA = GBP 2,000.
290
291	### Test 5 -- SA303 reduction
292	Input: Standard POA = GBP 5,000 each. Estimated current year = GBP 3,000. SA303 filed.
293	Expected: Reduced POA = GBP 1,500 each. Interest risk flagged.
294
295	### Test 6 -- Balancing payment with overpayment
296	Input: POAs paid GBP 4,000 + GBP 4,000. Actual SA balance = GBP 6,500.
297	Expected: Overpayment = GBP 1,500. HMRC refunds or sets off.
298
299	### Test 7 -- Late payment interest
300	Input: POA GBP 3,000 due 31 Jan. Paid 15 Apr (74 days). Base rate 5.25%.
301	Expected: Rate = 7.75%. Interest = GBP 3,000 x 7.75% / 365 x 74 = GBP 47.12.
302
303	---
304
305	## Prohibitions
306
307	- NEVER include Class 2 NIC, student loan, postgraduate loan, or CGT in the POA calculation
308	- NEVER compute POAs without checking both threshold tests (GBP 1,000 and 80% PAYE)
309	- NEVER advise filing SA303 without flagging the interest risk on shortfalls
310	- NEVER use current year income to compute POAs -- always prior year SA balance
311	- NEVER ignore the 31 January double-payment impact (balancing + 1st POA)
312	- NEVER present POA figures as definitive until the prior year return is filed and processed
313	- NEVER assume HMRC has automatically adjusted POAs after a return amendment
314	- NEVER conflate POA interest (simple, base+2.5%) with late filing penalties (separate regime)
315	- NEVER advise on penalty disputes without escalating to a qualified accountant
316
317	---
318
319	## Disclaimer
320
321	This skill and its outputs are provided for informational and computational purposes only and do not constitute tax, legal, or financial advice. Open Accountants and its contributors accept no liability for any errors, omissions, or outcomes arising from the use of this skill. All outputs must be reviewed and signed off by a qualified professional (such as a CPA, EA, tax attorney, or equivalent licensed practitioner in your jurisdiction) before filing or acting upon.
322
323	The most up-to-date, verified version of this skill is maintained at [openaccountants.com](https://openaccountants.com). Log in to access the latest version, request a professional review from a licensed accountant, and track updates as tax law changes.
324

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About

Use this skill whenever asked about UK Payments on Account (POA) for Self Assessment taxpayers. Trigger on phrases like "payments on account", "POA", "January payment", "July payment", "balancing payment", "SA303", "claim to reduce", "reduce payments on account", "do I need to make payments on account", "POA threshold", "tax underpayment", or any question about advance income tax payments under UK Self Assessment. Covers the two-payment schedule (31 January / 31 July), the GBP 1,000 threshold, the 80% PAYE test, balancing payment mechanics, SA303 claim to reduce, excluded items (Class 2 NIC, student loan, CGT), interest on late payments, and interaction with tax codes. ALWAYS read this skill before touching any UK POA work.

GBty-2025

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