What Happens After You Submit

What to expect after submitting your CT600 and accounts via TinyTax. HMRC timelines, confirmation emails, and troubleshooting.

What happens after you click submit on TinyTax? This guide walks through the full process — from submission to HMRC acceptance, and what to do if something goes wrong.

CT600 (HMRC) Submission

What Happens When You Click Submit

TinyTax connects to the HMRC Gateway using your Government Gateway credentials
Your CT600 data is packaged and transmitted to HMRC's Transaction Engine
HMRC returns a correlation ID — your unique reference for this submission

You'll see this in the submission modal:

> Submission Received > [Your correlation ID]

How Long Does HMRC Take?

HMRC processes submissions asynchronously. TinyTax automatically polls for the result:

Typical response time: Within a few seconds
Maximum wait in the modal: About 1–2 minutes

If HMRC hasn't responded by then, the modal will let you know. You can close it and check back later — TinyTax continues polling in the background.

What If HMRC Accepts?

The modal updates to show Accepted by HMRC in green. Your dashboard will show a green tick for this filing.

You'll also receive two emails:

Submission receipt — sent immediately, containing your correlation ID and company details
Acceptance confirmation — sent once HMRC confirms, including your corporation tax amount and payment due date

ℹ Your corporation tax payment is due 9 months and 1 day after your accounting period end. This is separate from the filing deadline. The acceptance email includes a direct link to pay HMRC online.

What If HMRC Rejects?

The modal shows the HMRC error message. Common reasons include:

Incorrect Government Gateway credentials
Company UTR doesn't match HMRC records
Data validation errors

You can fix the issue and resubmit immediately — rejections don't block future submissions. Your card is not charged on rejection.

Companies House Accounts Submission

What Happens When You Click Submit

TinyTax transmits your iXBRL accounts to Companies House
Companies House returns a submission number — your reference for this filing

How Long Does Companies House Take?

Companies House processing takes longer than HMRC:

Typical response time: 2–5 minutes
Maximum wait in the modal: About 6 minutes
Can occasionally take: Up to 24 hours in rare cases

TinyTax waits 2 minutes before the first status check (as recommended by Companies House), then checks every 10 seconds.

If processing hasn't completed when the modal times out, you'll see a Check Status Now button. You can also check from your dashboard at any time.

After Both Filings Are Accepted

Once HMRC and Companies House have both accepted your filings:

Your dashboard shows green ticks for both CT600 and Accounts
Your filing documents are saved and accessible from the dashboard
You're done for this accounting period

What You Might Need to Do Next

Action	When	Where
Pay your corporation tax	Within 9 months and 1 day of period end	Pay HMRC online
File your confirmation statement (CS01)	Annually	Companies House WebFiling
Start next year's filing	When your next period ends	TinyTax dashboard

Checking Filing Status

You can check the status of any submission from your TinyTax dashboard at any time. The status badges show:

Badge	Meaning
Green tick	Accepted
Amber clock	Pending (still processing)
Red cross	Error or rejection — action needed
Grey tick	Filed outside TinyTax

Common Questions

Q: I submitted but the modal timed out — is my filing lost? A: No. Your submission was received by HMRC or Companies House. TinyTax continues checking in the background and will send you an email when the result comes through. Check your dashboard for the latest status.

Q: Can I resubmit if my CT600 was rejected? A: Yes. Fix the issue (usually credentials or data), then submit again. There's no limit on resubmissions and no extra charge.

Q: I submitted CT600 but forgot accounts — can I do them separately? A: Yes. Go back to the submission preview and submit your accounts. CT600 and accounts are independent filings.

Q: How do I know if I need to pay tax? A: Your acceptance email shows your corporation tax liability. If it's £0 (dormant or no profit), there's nothing to pay. If there's tax due, the email includes a link to pay HMRC online.

Q: Can I amend my CT600 after it's been accepted? A: Yes. HMRC accepts amendments within 12 months of the original filing deadline. You can file an amended return through TinyTax.

Still Have Questions?

If something unexpected happened during submission, get in touch and we'll investigate.

Last updated: February 2026

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