Can't burnFrom using ERC20PresetMinterPauser


So I’ve deployed an ERC20 using the ERC20PresetMinterPauser.sol contract. When I try to use the burnFrom function I get an error.

:computer: Environment
Contract Version v3.2.0
Remix, Javascript VM

I mint some tokens to an address, and then when I use the burnFrom function for that address, I get this error:
“ERC20: burn amount exceeds allowance”.

I can use the burn function, but not the burnFrom function.

Any ideas? Thanks!

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Hi @pmk,

The caller of burnFrom doesn’t have a sufficient enough allowance.

I assume that you have a contract function performing burnFrom. The token holder needs to approve an allowance to the contract doing the burning. Just like when approving an allowance for transferFrom, see example: Example on how to use ERC20 token in another contract


So, even though the deployer of the contract is the admin and owner of it, it has to give itself permission to use the “burnForm” through the “increaseAllowance” function?

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Hi @pmk,

burnFrom allows the burning of tokens where a token holder has approved an allowance that can be used to burn their tokens.

To burn any accounts tokens, you could create functionality that calls _burn protected by Access Control. Though token holders would be rightly cautious under what circumstances their tokens could be burnt by a central authority. You would need to explain to your community when and how this would be used.

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