Provisional Sum Calculator

Compare the allowance in the quote with the actual cost and see the transparent effect of markup and VAT.

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Allowance inputs

Enter the allowance and actual cost.

Extra delivery, labour, other costs and credits below are entered excluding VAT. Keep the markup method consistent with the signed agreement.

Provisional sum itemOriginal contract total incl VAT (R)VAT rate (%)Original allowance (R)Allowance tax basisActual supplier/subcontract cost (R)Actual-cost tax basisDelivery ex VAT (R)Additional labour ex VAT (R)Other agreed cost ex VAT (R)Credits ex VAT (R)Markup methodMarkup (%)This provisional-sum adjustment has been approved in writing.

R±

Your allowance calculation will appear here.

No supplier or contractor is compared or recommended.

Independent by design

This is arithmetic and scenario support, not a price recommendation. The signed contract determines how provisional sums, markups and VAT must be treated.

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