Generally, you may use a p-card to purchase items except for any of the items below:
You can find a general list of general ledgers that the above items correspond to here.
Please use Buy2Pay or an RFP to pay for these items above.
For more information, see https://vpf.mit.edu/non-allowed-items-for-procard-purchases
What about tax?
As MIT is a tax-exempt institution, tax should not be charged on transactions in 30 states; if it is, a refund should be sought. See Guide to tax exemption at MIT for additional information on requesting tax exemption before and after a purchase is made.