The honest timeline most subbies actually experience
A clean CIS refund clears in 14 to 35 days from filing, and that covers roughly four out of five returns. The Construction Industry Scheme (CIS) is the arrangement where contractors deduct tax at source from what they pay you, usually at 20 percent, before you ever see the money. When those deductions come to more than your final tax bill for the year, the difference is your refund, and HMRC pays it out through Self Assessment.
The wait depends far more on when you file and how clean the return is than on how big the refund is. Filing in the first two weeks of April, when HMRC's repayment queue is shortest, is the single biggest lever you control. We deal with this every spring as specialist construction and CIS accountants, and the pattern is consistent: early, reconciled, well-supported returns get paid fast, and rushed late ones sit in the queue.
If your refund is already overdue, the cause is almost always one of three things, and the rest of this guide walks through each, plus the day-by-day timeline inside HMRC and the six moves that get you paid fastest.
Day by day: what actually happens once you press submit
Once you submit, the return moves through HMRC's automated risk checks first and only reaches a human if something flags. Here is what the elapsed days look like inside HMRC, based on the patterns we see filing returns for around 600 subbies a year. Numbers are calendar days from submission.
Day 0: the moment of filing
You file the SA100 with the SA103S (self-employment short pages) and the all-important CIS deduction figures entered correctly. HMRC's gateway sends a submission receipt within minutes. Save it. The reference number on that receipt is what you will need if anything goes sideways later.
Days 1 to 3: HMRC acknowledges and parks the return
Behind the scenes, HMRC's Connect system runs the return through automated risk filters. These look for unusual expense patterns, mismatches against employer PAYE feeds, and, crucially for CIS, whether your declared deductions tally with the figures contractors have reported on their monthly CIS300 returns to HMRC. Most returns sail through.
Days 7 to 14: automated checks complete
Internally, HMRC has either greenlit the refund or routed it to a real human at one of the security teams. Greenlit returns get queued for repayment within a fortnight in most cases. Pulled returns enter a separate queue and the letter usually lands within 4 to 6 weeks of submission.
Days 14 to 28: approval and payment instruction
This is the active payment window for clean returns. HMRC issues the approval, the repayment is generated and the BACS instruction goes out. Some refunds clear in 17 days flat. Others sit at "approved" for a week before the BACS run picks them up. There is no public scheduling for this and the variance is roughly the same whether your refund is £800 or £8,000.
Days 17 to 35: cleared funds
BACS settlement is 3 working days from the instruction date. Most clean CIS refunds for the 2025/26 tax year clear into the subcontractor's nominated current account between 17 and 35 calendar days from filing. Refunds filed in the first week of April are usually quickest because HMRC's queue is shortest then.
The fastest CIS refunds we see go to subbies who file between 6 and 14 April. Volume is low, the queue is empty, and HMRC's automated systems are running fresh. By contrast a return filed on 25 January, close to the deadline, can take 35 to 50 days even when clean, simply because the queue is at peak.
Why does HMRC pull some CIS returns for review?
HMRC pulls a slice of CIS refund claims for a routine security check because the scheme moves so much money at source, not because anything is wrong with you. Contractors deduct tax before the subbie even sees it, and over £6 billion of CIS deductions flow through HMRC each year. With that much moving, a percentage of repayment claims get checked as standard. We see roughly 14 percent of subbie returns pulled for review.
The triggers we see most often:
- Mismatch between your CIS figure and the contractor's monthly returns. If you say £8,400 was deducted but your contractor's CIS300 shows only £7,950, HMRC writes asking for the gap to be explained. This is the single most common trigger.
- First Self Assessment after going self-employed. HMRC understandably wants to verify the new UTR's first return.
- Unusually high allowable expenses relative to income. Claiming £18,000 of expenses on £24,000 of gross income will trigger a review almost every time.
- Bank details changed in the last 12 months. A repayment direction change is a classic fraud signal in HMRC's system.
- Random sampling. Sometimes you have just been picked out of the queue. Nothing to be done except respond promptly.
Reply to HMRC's evidence request within 30 days. If you do not, the return is suspended indefinitely and any refund stops with it. We have seen subbies wait 8 months on a refund because they ignored the letter. Read every brown envelope from HMRC the day it lands.
How to get your CIS refund as fast as possible
Speed comes from one thing: presenting a return HMRC has no reason to question. We file around 600 CIS subbie returns a year and the practical playbook for fastest clearance has six moves.
File in the first half of April. The new tax year starts 6 April. Returns filed between then and roughly 20 April see the shortest queue because volume is low. We start filing for our CIS clients on 7 April every year. Most clear by mid May.
Reconcile your CIS deductions before you file. Total up your monthly CIS payment and deduction statements (the slips your contractors give you) and compare to what you think you have earned. The figure on your return must match the contractors' figures HMRC already holds. We see returns delayed by £15 mismatches because the subbie added a number wrong.
Attach your CIS statements with the return. The online filing system lets you upload supporting documents. Adding the statements pre-empts about half the security reviews HMRC would otherwise run. It feels like extra admin. It saves four weeks.
Keep your nominated bank account current. Log into your HMRC personal tax account and check the bank details on file. A surprising number of refund delays are because the account on file is the one the subbie closed two years ago. The repayment bounces, HMRC writes a letter, and the timeline doubles.
Claim only expenses you can evidence. Mileage, materials, tools, accountancy fees, public liability insurance, work clothing, mobile phone use: all fine if you have the receipts and a clear basis. Do not pad. A £400 refund increase from optimistic expenses is not worth a 12 week security review.
Respond to any HMRC letter the day it arrives. Five working days is usually enough turnaround. The refund clock is paused until you reply, so every day you delay your response is a day added to the wait.
The numbers most CIS subbies actually see
For a full-time subbie on the standard 20 percent rate, the typical refund sits between £2,400 and £4,800 for the year. That range covers about 80 percent of the returns we file, for subcontractors with around £35,000 to £45,000 of gross income in the 2025/26 tax year, and the figure moves with the allowable expenses claimed.
Subbies on the unregistered 30 percent CIS rate (those who have not verified with HMRC) see proportionally larger refunds because more tax has been over-deducted at source. We have seen unregistered subbies receive £6,500 to £9,000 refunds on otherwise normal income. The fix for next year is to register, not to wait for the bigger refund: the unregistered rate exists as a deterrent and does not actually save you tax in the long run, it just shifts when you receive it.
A subbie working only part of the year, or one with significant tool and material costs, can see a refund in the £800 to £1,800 range. New entrants who register as self-employed mid-year and whose CIS deductions exceed their personal allowance plus expenses also routinely see refunds in this band.
Subcontractors with Gross Payment Status do not have CIS tax deducted at source at all. They invoice and receive 100 percent of their billing, then settle their tax through Self Assessment in the normal way. No refund cycle. Whether that suits you depends on your turnover and admin capacity, and it is worth a conversation before you apply.
Here is how the three common ways to get your CIS refund actually compare:
| What you need | DIY filing | Generic accountant | LOYALS CIS specialist |
|---|---|---|---|
| Reconciles CIS deductions to contractor CIS300s | ✗ You self-check | ● If asked | ✓ Standard before filing |
| Attaches CIS statements to pre-empt reviews | ✗ | ● | ✓ Every return |
| Files in early April for the shortest queue | ● If you remember | ✗ Often Jan rush | ✓ From 7 April |
| Handles an HMRC evidence letter for you | ✗ | ● Extra fee | ✓ Included |
| Open Mon to Sat for a quick question | ✗ | ✗ Mon to Fri 9 to 5 | ✓ 10am to 7pm Mon to Sat |
This is why most subbies who have waited months on a refund once move to a specialist who files it right the first time.
What this means for you in practice
If your refund is pending, the answer to "where is my money" is one of three: it is in HMRC's normal queue and due within two weeks, it has been pulled for review and a letter is coming, or there is a mismatch you need to find and fix. Working out which one you are in takes about ten minutes.
Check your HMRC personal tax account first. Sign in and look at the Self Assessment section. If the return shows as received but no repayment activity is logged after 14 days, you are either still in the queue or being reviewed. After 28 days with no movement and no letter, it is worth a phone call to the Self Assessment helpline on 0300 200 3310. Have your UTR ready.
Going forward, the move that consistently shortens the wait is filing earlier in the tax year and reconciling your CIS figures meticulously before you submit. We typically file CIS returns for clients in the first three weeks of April and most refunds clear within a month. That is the simplest single change that compounds year after year. You can hand the whole thing over in a free call with LOYALS.
What if you do not want to wait at all?
Subbies who are tired of the annual refund cycle have two structural moves. The first is applying for Gross Payment Status, which removes CIS deductions entirely so you collect your gross billings and settle tax through Self Assessment on a normal schedule. The second is incorporating as a limited company, which moves you out of CIS at the personal level and into Corporation Tax at the company level. The structures suit different turnover levels, expense profiles and client bases, so there is no universal right answer. Our CIS and construction service covers both.