Formula
What this Oman VAT calculator does
Two modes for the 5% standard rate. (1) Add VAT: enter a pre-tax price, get the total with VAT added. Useful when pricing a product or preparing a quote. (2) Extract VAT: enter a total that already includes VAT, get the base price and VAT portion separately. Useful for understanding receipts, expense claims, or reverse-engineering invoices. Fixed at 5% per the Oman Tax Authority standard rate, in OMR.
VAT in Oman - regulatory context
Standard rate 5%, administered by the Oman Tax Authority. Since april 2021. Registration is mandatory above a tiered turnover threshold (consult the Oman Tax Authority portal for current figures). For e-invoicing requirements, formats, and exemption rules, the Oman Tax Authority official site is the authoritative source. This calculator handles the math; issuing tax invoices requires a registered system.
Zero-rated vs exempt - common confusion
Both look like 'no VAT charged' on the invoice, but they're treated very differently for business inputs. Zero-rated (0% applied): you charge 0% VAT to the customer BUT you can still recover input VAT on your own purchases. Common categories: exports outside the GCC, international transport, certain medicines, basic foods (varies by country). Exempt: no VAT charged AND no input VAT recovery on related purchases. Common categories: residential real estate sales (used), certain financial services like loans, bare land, local public transport. If you're VAT-registered, the difference is significant - zero-rated is much better cash-flow-wise.
How to extract VAT from a total - the math
When a price says it already includes VAT and you need the base: base = total / (1 + rate). For Oman 5%: divide the total by 1.05 to get the base. The common mistake is subtracting the rate directly from the total - that gives a WRONG base because the percentage relationship is non-linear. VAT is calculated on the base, not on the total, so you must always divide by (1 + rate).
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