Prime Minister David Cameron's official spokesman confirmed that details of the cost to the public purse would be published after next Wednesday's service has taken place.
Labour ministers have grumbled about the cost for the taxpayer and have accused the Tories of using Thatcher's death for political gain.
But Tory minister William Hague defended the taxpayer contribution to the funeral, pointing out: "It's right Parliament meets and commemorates such a leader of historic proportions in our country's history.
When it comes to money, the rebate she negotiated for this country from the EU has brought us so far £75 billion
"She changed the course of our history and there have been many comments over the last few days from all corners of the political spectrum.
"When it comes to money, the rebate she negotiated for this country from the EU has brought us so far £75 billion - which is twice the size of our annual defence budget.
Do you agree with William Hague?