Philip Hammond's decision to scrap the National Insurance hike for the self-employed is only the latest in a string of U-turns by chancellors.
Here's a look at previous Budget reversals and why they happened:
Disability benefit cuts
Controversial reforms to Personal Independence Payments (PIP) for the disabled were announced by George Osborne in March 2016.
It would have meant 370,000 disabled people would have lost an average of £3,500 a year.
But it was dropped less than a week later after Work and Pensions Secretary Iain Duncan Smith resigned in protest.
Tax credit cuts for the low paid
George Osborne again caused controversy in his 2015 Budget when he announced tax credit cuts for the low paid which would have cost them on average £1,000 a year.
But the plans were shelved after they were savaged by critics and then defeated in the House of Lords.
Osborne's 2012 Budget became known as the "omnishambles" after a string of announcements had to be reversed or scaled down.
This famously included the so-called "pasty tax" imposition of VAT on hot snacks.
"Church tax" charges on listed buildings and the "caravan tax" plan to raise VAT on static caravans from 5% to 20% were also dropped.
The 'borrowing' Budget
In 2008, then Chancellor Alistair Darling was forced to borrow almost £3 billion to compensate those who had lost out from his Budget's decision to scrap the 10p rate of income tax.