Tax rises are “inevitable”, a leading think tank has warned hours before Rachel Reeves sets out her Budget priorities.The chancellor will use a speech today to pave the way for sweeping tax rises expected to be announced at the end of the month,pledging to make “important choices that will shape our economy for years to come”. In a major pre-Budget address, she will set out her three priorities for the fiscal event – cutting hospital waiting lists, the national debt and the cost of living. The Resolution Foundation has said that there was a way to implement the “inevitable” tax rises that “boosts confidence in the economy and the public finances, while also reducing child poverty and the cost of living”.Ms Reeves is expected to promise a Budget “led by this government’s values, of fairness and opportunity and focused squarely on the priorities of the British people”. Acknowledging growing speculation over possible tax rises, she will argue that it is important the public understands the circumstances facing the country. In its pre-Budget review, the Resolution Foundation have said the chancellor should aim to double her fiscal headroom in her statement to the Commons on 26 November. This would result in the buffer against unexpected changes in economic headwinds increasing to £20bn, but the think tank acknowledged that an increase of £15bn was “perhaps” more realistic.“This would send a clear message to markets that she is serious about fixing the public finances, which in turn should reduce medium-term borrowing costs and make future fiscal events less fraught,” the report said.Tax-raising measures could include freezing personal thresholds, potentially raising £7.5bn if done for two years, according to the foundation, alongside “pro-growth” reforms to the tax system, targeting wealth, motoring and property taxes.“So, although tax rises are inevitable, there is a way to do them which boosts confidence in the economy and the public finances, while also reducing child poverty and the cost of living.” Alongside this, it said that ministers should also consider new targeted policy measures to help with the cost-of-living crisis, such as help with energy bills. The chancellor’s address is set to come after weeks of expectation management and growing reports of planned tax rises as she scrambles to fill a black hole of up to £50bn in the public finances to balance the books and keep to her golden rule of funding day-to-day spending with tax receipts.( More