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Deadlines & compliance
CIS Monthly Return Deadline Management
A monthly deadline that never stops, tracked reliably for every contractor client.
Built by a practising Chartered Accountant · Unlimited users · Free for 60 days
Recurring tasks
Repeat work is created automatically on schedule.
- Premier Books Consultancy
- Cranleys Chartered Accountants
- CJM Accountants
- Towpath Accounting Solutions
- Auditax International
- RS
Quick answer
CIS deadline management means tracking each contractor client's monthly CIS return, due by the 19th of every month, along with the subcontractor verification and deduction records behind it. Because the deadline repeats every single month with no off-season, a manual tracker is prone to gaps that recur monthly rather than annually.
What is CIS deadline management and why does it matter for UK practices?
It's the discipline of never letting the 19th-of-the-month CIS return deadline slip for any contractor client, month after month, without exception, since there's no annual quiet period to catch up in.
CIS monthly returns are due by the 19th of each month, covering payments made to subcontractors in the previous tax month. For a firm with several contractor clients, that's a recurring deadline every single month across the whole client bank, with no seasonal break.
Behind each return sits verification of subcontractor status and accurate deduction records, meaning the return itself is the final step of a process that needs to run correctly throughout the month, not just be remembered on the 18th.
Why does CIS deadline management keep going wrong?
No off-season to recover from a slip
Unlike annual deadlines, a missed CIS return is followed almost immediately by the next month's deadline, giving no breathing room to fix the underlying process.
Subcontractor verification is skipped under time pressure
When the return deadline looms, verification checks for new subcontractors are sometimes rushed or missed, creating errors in the return itself.
Deduction records aren't kept consistently
Without a routine for recording deductions as payments happen, reconstructing them each month close to the deadline is time-consuming and error-prone.
Contractor clients send payment information late
Data often arrives close to the 19th, leaving little time to prepare and check the return before submission.
Multiple contractor clients compete for the same window
If every client's return is prepared in the final few days before the 19th, staff capacity is stretched every single month.
What does a missed CIS deadline cost an accounting firm?
Penalties apply for late CIS returns and can escalate the longer they remain outstanding, and because the deadline repeats monthly, a firm with a systemic tracking weakness risks accumulating penalties across several months before the underlying process is fixed.
For construction clients, CIS compliance is often closely linked to their ability to claim deductions correctly, so an error or delay can affect their cash flow directly, adding pressure to the accountant relationship.
How do you manage CIS deadlines reliably every month? Step by step
- 1
Set the CIS return as a recurring monthly task for each contractor client
Generate the task automatically every tax month rather than creating it fresh each time.
- 2
Set a data collection cut-off well before the 19th
Give a clear internal deadline for contractor clients to send payment and subcontractor information.
- 3
Verify new subcontractors as they're added, not at month end
Build verification into the ongoing process rather than leaving it to be rushed close to the return deadline.
- 4
Record deductions as payments are made
Keep a running record through the month rather than reconstructing figures from scratch before the deadline.
- 5
Assign a named preparer to each contractor client's return
Avoid returns sitting unowned in a shared queue as the deadline approaches.
- 6
Stagger preparation across the month where possible
Don't leave every contractor client's return until the final few days before the 19th if information arrives earlier for some.
- 7
Review the month's returns immediately after submission
A short review of what worked and what didn't helps smooth out recurring bottlenecks before the next month begins.
How does Remindoo help manage CIS deadlines?
Remindoo's recurring tasks generate each contractor client's CIS return task automatically every month, tied to the 19th deadline, so it doesn't rely on someone remembering to create it fresh each time. Detailed task creation sets a data collection cut-off ahead of the statutory date, with a named preparer assigned to each client's return, and automated reminders prompt both the client and the internal team as that cut-off approaches. Because the deadline repeats monthly with no off-season, task and subtask templates help standardise the steps behind each return, verification, deduction records and submission, so the process is consistent whoever is preparing it. Strong task filters give a manager a single view of every contractor client's CIS status each month, useful for spotting which clients are consistently sending information late.
Recurring tasks
Repeat work is created automatically on schedule.
See featureDetailed task creation
Set priority, assignee and deadline on every job.
See featureAutomated reminders
Timely prompts before work becomes urgent.
See featureTask and subtask templates
Checklists that make every job consistent.
See featureStrong task filters
Filter by tags, deadline, assignee and status.
See featureSpreadsheets vs Remindoo: what changes?
| Area | Spreadsheets & email | With Remindoo |
|---|---|---|
| Monthly task creation | Recreated manually every month | Generated automatically via recurring tasks |
| Subcontractor verification | Rushed close to the deadline | Built into a standard subtask template |
| Deduction records | Reconstructed at month end | Recorded consistently through the process |
| Data collection cut-off | Informal, chased ad hoc | Reminder-driven with a clear internal deadline |
| Firm-wide visibility | Checked client by client | One filtered view of all CIS clients |
See it with your own clients
A 30-minute walkthrough using your services and deadlines.
Why is CIS deadline management harder to sustain than an annual deadline?
Because the 19th-of-the-month deadline recurs continuously with no seasonal gap, any weakness in the process is exposed again almost immediately, unlike an annual filing where there's a full year to fix an underlying issue before it recurs.
This is why automating the recurring task itself, rather than relying on someone to recreate it monthly, matters more for CIS than for most other deadlines a firm tracks.
“Managing deadlines and tasks is much easier.”
Frequently asked questions
When is the CIS monthly return due?
By the 19th of each month, covering payments made to subcontractors in the previous tax month.
Why is CIS deadline management harder than annual deadlines?
Because it repeats every month with no off-season, so a tracking weakness causes a problem again almost immediately rather than once a year.
What needs to happen before the CIS return itself is prepared?
Subcontractors need to be verified and deduction records kept accurately through the month, so the return isn't reconstructed from scratch at the last minute.
Can Remindoo automate the recurring monthly CIS task?
Yes, recurring tasks generate the next month's CIS return task automatically for every contractor client, tied to the 19th deadline.
Is Remindoo free to try for a construction-focused practice?
Yes, it's free for 60 days, enough time to run at least one or two monthly CIS cycles through the system.
Does Remindoo submit the CIS return to HMRC?
No, Remindoo tracks the deadline and manages the task, verification steps and reminders around it; submission remains your existing process.
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Sources
Comparing options? Read our guide to accounting practice management software.
Last updated: . General guidance, not regulatory advice. Check with your professional body.
Why recording every task matters in an accountancy practice
Accounting firms run on deadlines: VAT returns, payroll, confirmation statements, accounts and Self Assessment. Recording every job as a task, with an owner and a date, is the simplest way to make sure nothing is missed.
Avoid penalties
HMRC and Companies House charge penalties for late filing. A task for every deadline, with an internal date before it, gives the team a buffer.
Nothing depends on memory
Recorded tasks mean work continues when someone is off sick, on leave or has left the firm.
Consistent quality
Subtask checklists make every job follow the same steps and reviews, whoever does the work.
Visibility for managers
Filters by owner, status and deadline show at a glance what is late, what is due and who needs help.
Practical tips from UK practice
- Set an internal deadline two to four weeks before every statutory deadline.
- Use recurring tasks for repeat work such as VAT, payroll and bookkeeping.
- Break larger jobs into subtasks, including a review step.
- Comment on the task instead of by email, so the history stays with the work.
Related Remindoo features
Written and reviewed by Waqas Sagar ACA FCCA FMAAT, Chartered Accountant with 18+ years in practice. Founder and MD of Accotax, an ICAEW, ACCA and AAT regulated London practice that has served over 5,000 clients, and founder of Remindoo. Guidance is general; check current GOV.UK and professional body guidance for your firm.
What UK practices say about Remindoo
Read all reviews on Trustpilot“With Remindoo, everything from the first enquiry to onboarding and ongoing client management is tracked in one place… It saves us hours and gives me, as a practice owner, complete visibility of where the firm stands.”
“The biggest benefit is having clients, tasks, deadlines, workflows, proposals and communication all organised in one place.”
“During my trial, the team were absolutely amazing. They helped onboard my clients, set up my settings and made sure everything was ready for me to use… they made the whole process completely stress-free.”
“It brings client information, tasks, recurring deadlines, workflows and reminders together in one place, giving us much better visibility across the team.”
