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OpenAPIReference & guides7 tools
UK Corporation Tax Calculator
Corporation Tax for one accounting period at the 19% small profits rate, the 25% main rate and marginal relief, with payment and return dates
Unify Dynamics LLC
Tools7read-only
Sign-inNoneno account, no key
Data keptNoneprocessed in memory
PriceFreeoptional Pro limits
StatusLiveMCP + REST
Works withMCP · RESTany agent
Try asking
Real questions, and the tools your agent calls to answer them.
My company made GBP 90,000 of taxable profit in the year to 30 September 2026: how much Corporation Tax and how much marginal relief?
Tools called
corp_tax_estimatemarginal_reliefWhat is my effective Corporation Tax rate at GBP 180,000 of profit?
Tools called
effective_rateI own three companies: how do the small profits limits change?
Tools called
associated_companies_adjustmentOur first accounting period is only three months long: what are the limits for it?
Tools called
short_period_adjustmentWhen must I pay Corporation Tax and file the Company Tax Return for the year ending 31 March 2027?
Tools called
company_deadlinesWhat are the current Corporation Tax rates and limits, and how confident are you in them?
Tools called
rate_referenceAbout
UK Corporation Tax Calculator estimates the Corporation Tax of a UK company for one accounting period from the taxable profits you supply. corp_tax_estimate applies the 19% small profits rate up to GBP 50,000, the 25% main rate above GBP 250,000 and marginal relief in between using the HMRC formula (fraction 3/200 times the upper limit less augmented profits, times taxable profits over augmented profits), and it reproduces the worked example in HMRC's Company Taxation Manual. marginal_relief and effective_rate expose the relief and the resulting rate, associated_companies_adjustment divides the limits by one plus the number of associated companies (GOV.UK: 3 other companies give GBP 12,500 and GBP 62,500), and short_period_adjustment scales the limits for a period shorter than 12 months. company_deadlines returns the payment date (usually nine months and one day after the period end) and the Company Tax Return date (12 months after). rate_reference lists every rate, limit and rule with its GOV.UK or HMRC source, effective date and a verification label. Exact decimal arithmetic, local only, nothing stored or filed. General information only, not tax advice.
Sources: Reference data from official sources (gov.uk); every answer states its source, date and validity period.
Privacy
The publisher, Unify Dynamics LLC, states that tool inputs are processed in memory and not retained.
Data not collectedNo account, no profile, no stored prompts or results.
What it can do
7 tools, grouped by job. Every one is read-only or compute-only.
- Corp tax estimateEstimate Corporation Tax for one accounting period using the 19% small profits rate, the 25% main rate and marginal relief between the limits.
- Marginal reliefReturn the marginal relief in the band between the lower and upper profits limits, with the limits used.
- Effective rateReturn the effective Corporation Tax rate (tax divided by taxable profits) for a profit figure.
- Associated companies adjustmentDivide the GBP 50,000 and GBP 250,000 limits by 1 plus the number of associated companies (12-month period).
- Short period adjustmentReturn the marginal relief limits for an accounting period shorter than 12 months (days divided by 365).
- Company deadlinesReturn the Corporation Tax payment date (9 months and one day after the period end) and the Company Tax Return date (12 months after).
- Rate referenceReturn the Corporation Tax rates, limits, marginal relief fraction and deadline rules held here with source, effective date and verification label.
Information
PublisherUnify Dynamics LLC
CategoryMoney & business
LanguagesEnglish
Built forGB
CompatibilityAny MCP client · any agent · REST
Version0.1.0
MCP endpoint
https://uk-corp-tax-calc.connectorbay.com/mcpREST APIopenapi.json
CountryUnited Kingdom
FunctionInvoicing & tax
LayerDeep connectors
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