All entities submit their yearly tax returns to the government for the current fiscal year. Therefore, the GDP-by-tax approach can be used to find GDP amount by government officials and the ones having acces to tax database.
REMARK: Please note that this GDP found by using the folowing application will give the official GDP figure which excludes the GDP caused by unofficial (e.g. shadow, unrecorded) ecomomy, moreover it is GDP at curent prices. However, the GDP anounced by government is the sum of both official and unofficial GDP, and is GDP at constant prices.
Net_TOS is the countrywide total of the sum of all;
Sales excluding VAT is the countrywide total of the sum of all money received during the current fiscal year by economic entities, non-profit entities, and not-for-profit entities via rent, interest, goods and services including durable goods (or goods that are subject to depreciation), donations, fund raising, fees and so on.
Purchases excluding VAT is the countrywide total of the sum of all payments for rent, interest, goods and services including durable goods (or goods that are subject to depreciation), donations, fundraising, fees, and so on made by economic entities, non-profit entities, and not-for-profit entities during the current fiscal year.
Now the profit amount found above could be used in GDP equation:
(*) Please note, TOS is all the taxes added on to the prices like VAT or Sales tax whichever is used in your country, and it includes property tax on property sales, and stamp tax added on the price of contracts.
(**) Please note, if the sales and percentages are entered using official, then the GDP amount found above represent the formal GDP with current prices. That is, you should add informal GDP amount to compare with the official GDP (with current prices) anounced by your country.