More than 8.7million people have been placed on furlough since the start of the coronavirus pandemic - with the number set to rise further in the next fortnight.
The Government expects the scheme to cost the economy more than £64billion - which is part of the reason why it's closing to new applicants from July.
Several more changes are set to take place on the Job Retentions Scheme this summer - and Martin Lewis has now explained exactly what it means for employees affected by the coronavirus crisis.
Speaking on tonight's ITV Money Show, these are the key points he flagged for workers as Chancellor Rishi Sunak prepares to wind the scheme down in the coming weeks.
July changes
"From July, you'll be able to go back to work part time," Martin Lewis said.
"Workers will be able to claim the full 80% pay on furlough, but at the same time only work a small number of hours. This is to help many businesses as they get back on their feet with social distancing and more measures in place."
Employers will be able to choose what hours staff work as part of this - they'll then have to tell HMRC exactly how many shifts the employee has completed.
To qualify, you have to have been on furlough for at least three weeks by the end of June. This is because on July 1, the scheme is also closing to new applicants.
August could spell job cuts
"In August, employees will continue to have 80% of their pay subsidised by the Government, however, all employers will have to over national insurance and pension contributions," he said.
This is equivalent to around 5% per person.
However, Martin has a warning for these employees as this is will mark a crucial point for businesses.
"What that could mean is that if you are a member of staff that they don't think will have a viable job from October, you could be made redundant in August. This is to avoid paying the additional amount," Martin said.
He warned this could potentially be millions of jobs - though employers will have to place you on consultation before enforcing any of these changes.
September and October
In September, the Government's contribution will drop to 70% and employers will be forced to pay the extra 10% plus additional workplace contributions on top.
This will then drop to 60% in October when employers will have to cover 20% of wages.
The scheme will then close on October 31.
'I'm on furlough and my employer is forcing me to take annual leave - is this allowed?'
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"I believe the general rule is that employers can ask you to take annual leave as long as they give you more than double the usual amount of notice - which means two weeks," Martin explained.
He then asked lawyer Nadia for advice on your rights if firms don't play by the book.
"If your employer doesn't give you notice, you can object and take proceedings to the employment tribunal.
"If you're in a union, ask for their help or put in a grievance - but be aware you only have three months to do that."
'I'm on maternity leave - what will happen when I return to work in July?'
"To qualify for furlough, you have to have done three weeks on it by June 30. This means if you're on maternity leave and about to return to work, you may miss the cut off date," Martin said.
"This could leave you at greater risk of redundancy, though doing that would be discrimination."
Speak to your employer and if they do threaten redundancy, get advice from an employment tribunal, he added.
Self-employed changes
"A second grant is coming," Martin Lewis said.
"This will be the last coronavirus grant and will be bigger than the previous one - though you can choose which one you join."
"The new grant will cover 70% of profits up to £6,570 - equivalent to £2,190 a month.
"The current one covers up to 80%."
Chancellor Rishi Sunak is expected to release further information on the new scheme on June 12, with the grant open to applicants from August.
"On the scheme you will still be able to work and claim the grant - which is the opposite to how furlough works.
"All you have to do is declare it on the form and you'll get the financial support."
We've got a full guide on the self-employed changes, here.