Hayley Rich who employs an assistant for her home childminding business, is one of those who will have to use MTD from April.
"It will make a significant difference to my business - I've got to find the money up front to pay the decorator, or buy a new sofa - with wear and tear, it meant I could save that money up.
"I've got to change everything to fit in with the new way HMRC are doing it. Accounting-wise it's a pain - I can probably get that money back, but it's about laying it out first."
Crouch set up an online petition opposing the changes, which said they risked "tipping an already fragile childcare system into crisis". It has so far had more than 4,500 signatures.
"If the allowance is removed, childminders will be left with no easy choices - absorb the costs themselves, increase fees for parents - often impossible for funded hours where parents just get funded places - reduce what they offer, or close altogether," he said.
In a statement, HMRC said: "We anticipate very few childminders will need to sign up for Making Tax Digital from April, and those that do can still claim deductions for costs of wear and tear.
"They must include accurate records of all business expenses in their quarterly updates - and may be able to claim more tax relief than they currently do.
"As with other sole traders, MTD will allow childminders to keep better track of their finances, helping their business to grow."