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A digital services tax (DST) generally applies to gross revenue from specified digital activities attributed to users or customers in a jurisdiction. Corporate income tax (CIT) generally applies to taxable profits under that jurisdiction’s income-tax rules. Because a DST is generally designed to operate alongside, not replace, ordinary income tax, a business may need to assess both taxes on its activities.
How a digital services tax differs from corporate income tax
| Comparison | Digital services tax | Corporate income tax |
|---|---|---|
| Tax base | Usually gross revenue from activities specifically defined by local law, attributed to users or customers in the taxing jurisdiction. | Taxable profits calculated under local income-tax rules, including their deductions and adjustments. |
| Who or what is covered | Often limited to specified digital services and businesses meeting group-wide and local revenue thresholds. Categories, nexus tests and thresholds differ by jurisdiction. | Businesses within a jurisdiction’s ordinary corporate tax rules, subject to rules such as residence, source and permanent establishment. The territorial reach depends on local law. |
| Effect of low or negative margins | A revenue-based charge may still require analysis when an activity has low margins or is loss-making. Some laws provide special calculations or relief. | Tax generally depends on taxable profit after applicable deductions and adjustments; a loss or low profit can therefore affect the amount due, subject to local rules. |
| Relationship between the taxes | OECD commentary says DSTs are generally designed to apply in addition to a generally applicable income tax, not as a substitute for it. Domestic treatment, including deductibility, must be checked separately. | CIT may remain due even when a DST applies. Whether a DST can be deducted or credited depends on the relevant jurisdiction’s rules. |
The OECD’s 2025 GloBE commentary also treats DSTs generally as gross-revenue taxes, not income taxes, for purposes of the GloBE Covered Taxes definition. That classification concerns the Pillar Two rules; it does not settle how every country treats a DST for domestic deductions, credits or other tax purposes.
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What the UK example shows
The UK illustrates how a DST can be narrowly defined rather than imposed on every business that uses digital technology. HMRC’s guidance identifies three covered activity categories: social media services, internet search engines and online marketplaces. It describes the tax as applying to gross revenues from providing a covered activity to UK users, so classifying revenue streams and attributing them to users are key parts of the calculation.
| UK DST test or amount | HMRC guidance |
|---|---|
| Worldwide threshold | More than £500 million in worldwide digital-services revenue for the group. |
| UK-user threshold | More than £25 million of digital-services revenue attributable to UK users for the group. |
| Allowance | An annual £25 million allowance applies to UK digital-services revenues. |
| Usual rate | 2% on UK digital-services revenues above the allowance, once both thresholds are exceeded. |
These are UK-specific figures, not an international template. HMRC’s relevant manuals were last updated on 31 July 2024, so businesses should check current legislation and guidance for the filing period they are assessing. The UK government says UK DST is deductible for corporation-tax purposes subject to normal corporation-tax rules; that treatment should not be assumed in another country.
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Why a headline corporate tax rate is not enough
A statutory CIT rate does not, by itself, show what a particular business will pay. The taxable base, deductions, incentives and special regimes can change the result. OECD Corporate Tax Statistics 2025 reports an average combined statutory corporate income tax rate of 21.2% in 2025 across the Inclusive Framework jurisdictions covered. This is an average of statutory rates, not an effective rate or a prediction of any company’s tax bill.
For a meaningful comparison, model each tax using its own rules: locally defined in-scope revenue for a DST and locally determined taxable profit for CIT. Comparing a DST percentage directly with a CIT rate can mislead because the percentages apply to different bases.
How OECD Pillar One and Pillar Two fit in
Pillar One: Amount A
The OECD describes Amount A as a coordinated reallocation to market jurisdictions of taxing rights over a share of the profits of the largest and most profitable multinationals operating in those markets. The OECD says its Multilateral Convention is intended to improve tax certainty and remove DSTs. Do not assume that this has already removed every national DST: implementation and country participation are time-sensitive and must be checked for the relevant jurisdiction and period.
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The OECD’s GloBE rules provide for top-up tax where a multinational group’s jurisdictional effective tax rate, measured under those rules, falls below the agreed 15% minimum. The OECD overview identifies the relevant group threshold as annual revenue above EUR 750 million. This is a separate coordinated minimum-tax framework, not a replacement for domestic CIT calculations or DST rules.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How to assess a business’s exposure
- Map the relevant jurisdictions. List where the group has users or customers, entities, staff, assets, permanent establishments or other potentially relevant activity. The applicable nexus and filing rules are local.
- Classify revenue by service. For each jurisdiction, check whether each revenue stream falls within the statutory DST categories. Being a digital business does not by itself make every revenue stream taxable under a DST.
- Apply local attribution and threshold rules. Identify how the law assigns users or customers to a jurisdiction, aggregates group revenue, tests global and local thresholds, and applies allowances. The UK example shows why these are separate calculations.
- Calculate DST and CIT separately. Apply the DST to the locally defined in-scope revenue base and calculate CIT from taxable profits under local rules. Check for any low-margin alternative calculation or loss-related rule that applies to the activity.
- Check tax interactions. Confirm local deductibility, credits, treaty provisions, relief for similar taxes and any effect on Pillar Two calculations. One country’s treatment does not establish another’s.
- Confirm legal status and effective dates. Distinguish enacted measures from proposals and verify the rules for the filing period. A Tax Foundation Europe survey current to April 2026 reports differing DST implementation and proposal statuses across Europe; it is a secondary overview, not a substitute for national legislation or tax-authority guidance.
When comparing jurisdictions, keep the decision factors together: tax base, covered services, user or customer nexus, group and local thresholds, rate, allowance, margin relief, filing and payment obligations, interaction with CIT, and effective date.
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