The Revenue Budget comprises revenue receipts and expenditure met from these revenues. The revenue receipts include both tax revenue (like income tax, excise duty) and non-tax revenue (like interest receipts, profits). Capital Budget consists of capital receipts {like borrowing, disinvestment) and long period capital expenditure (creation of assets, investment).
Capital receipts are receipts of the government which create liabilities or reduce financial assets, e.g., market borrowing, recovery of loan, etc. Capital expenditure is the expenditure of the government which either creates assets or reduces liability. Capital budget is an account of assets and liabilities of the government which takes into consideration changes in capital.