If you ever want to sell your company the purchase price will be discounted by the amount of sales tax liabilities you have (source: have seen this happen). It'

If you ever want to sell your company the purchase price will be discounted by the amount of sales tax liabilities you have (source: have seen this happen). It's easier to get ahead of it and start collecting and filing sales taxes now so there isn't a growing sales tax liability. That said, depending on how big OP's company is it might be below sales tax thresholds in most/all jurisdictions.