The Chancellor delivered the most watched Budget in a generation this week, as he outlined how the country will repay the Covid bill, while fixing unemployment and an economy on its knees.
Sunak announced major tax changes, new minimum wage rates and more support for those out of work as a result of the pandemic.
Revealing the £20 uplift would be extended until September, the Chancellor said the measure, which is worth £1,000 a year, would help those hit hardest by Coronavirus.
The payment was increased by £20 a week in April 2020 after Covid forced millions of people out of work.
It's been described as "lifeline", that's helped people afford food, rent and even medical care during lockdown.
But campaigners said the top up, introduced at the start of the crisis, should be permanent.
The chancellor also brought forward previously announced changes to help people keep more of their benefit.
From April, Universal Credit claimants who get a loan, or advanced payment while their application is being processed, will get two years rather than one to pay it back.
And maximum repayments will be set at a lower level - 25% rather than 30% of their benefit.
The changes are part of a number of big - and hidden - updates coming as the Treasury boss looks to foot the £400billion Covid bill.
But what else is changing? We take a look below.
1. The £20 Universal Credit uplift has been extended
The £20 weekly increase to Universal Credit payments will continue for a further six months, the Chancellor has announced.
Rishi Sunak said the benefit uplift, introduced last April to mitigate the impact of coronavirus on families, will remain in place until September.
It was previously due to end on March 31.
The number of people claiming universal credit in the UK has doubled since the start of the pandemic, surging from 3million in March 2020 to 6million at the start of this year.
Around 446 people were still making new claims every hour in the first week of 2021, and a total of 4.5million people have made a claim for the benefit since the start of the public health crisis.
But charities have called on the government to make the top up permanent, saying families need "help and certainty, not a stay of execution".
Imran Hussain, Action for Children's director of policy and campaigns, said: "It makes no sense to cut this lifeline in six months when the furlough scheme will have ended and unemployment is expected to be near its highest - exactly when families will need it most."
2. The uplift will end in October
Despite the extension, Sunak confirmed the £20 uplift - equivalent to £80 a month - would be cut from October 1.
The Chancellor ignored pleas from anti-poverty campaigners and charities, saying he will not extend the £20-a-week payment or make it permanent.
Charities said the autumn pay cut would send benefit payouts to their lowest level since the 1990s.
Cross-party MPs said an extension should last a year at least - and the Resolution Foundation think tank warned the cut-off will cause a 7% fall in income for the poorest households.
Resolution Foundation chief executive Torsten Bell said: "It's a very bad idea to be removing the temporary uplift to Universal Credit right at the end of September.
"That's going it exactly when unemployment is expected to rise.
"It's taking away seven per cent of the incomes of the poorest families in Britain in the second half of this year.
"The Chancellor shouldn't be doing that. It will also take the basic level of benefits back to levels we haven't seen since the early 1990s."
3. Advance Universal Credit payments
The Budget document also revealed a change to Universal Credit advance payments.
Claimants can request an upfront loan on their first payment to tide them over during the five week wait period.
These advances currently have to be paid back in instalments over 12 months - but that repayment period is set to increase to 24 months.
Deductions are currently capped at 30% of the standard allowance, but this will reduce to 25%.
The measures will now come into force from April 2021 instead of October 2021.
4. Minimum Income Floor
While the Chancellor unveiled fourth and fifth SEISS grants plus support for 600,000 self-employed people previously excluded from support, there were some long-term cuts buried in the small print.
The Budget document states the Minimum Income Floor (MIF) - which limits how much self-employed people can claim - will be reinstated at "the end of July" after a 16-month suspension.
But the measure still has a one-year grace period and work coaches will get "discretion" not to apply it if they feel someone is still in financial difficulty.
Normally, for every £1 of earnings a low-paid worker loses in a pay cut, they get 63p back in Universal Credit.
But under the MIF, DWP assessors treat people who are "gainfully self-employed" as though they earn minimum wage - even if they don't actually earn that much.
That means once a person's earnings dip below the "floor", their Universal Credit is capped.
5. Working tax credits
Brits on working tax credits will get a £500 one off payment to help them through the Covid crisis.
Sunak said that because of the way that the Working Tax Credits system works, people will not be able to get the extra weekly £20 given to Universal Credit claimants.
Instead, they will be given a lump sum upfront.
6. Universal Credit surplus earnings threshold extended
Universal Credit claimants will continue to get the higher surplus earnings threshold of £2,500 until April 2022, the Budget said.
But next April it will return to the £300 rate.
Surplus earnings are taken into account in your next monthly assessment period for Universal Credit.
For example, if your monthly earnings are more than £2,500 over the threshold, the money falls under "surplus earnings".
These surplus earnings are then carried forward to the following month and used to calculate your next payment.
If your regular income and surplus earnings are then still over the amount where your payment stops, your Universal Credit payment will be adjusted.
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