RE: GST ITC's on my self employment home office expenses? My office is 10% of home sq.ft. do I claim 10% GST ITC's on hm expenses? 90% GST ITC's amount goes where then?

[hollanddr3111]

Can I include the 90% unclaimed GST amounts back onto my home expense totals? Or does that amount just become unclaimed?  Can I claim all the GST on Auto fuel receipts (eventhough I only drove for business 66% of total KM's on my vehicle?) So the remaining GST ITC amounts become unclaimable? or could they be rolled back into an expense somehow?

[TurboTaxCarol · Accepted solution]

Every expense that you have must be prorated based on the amount used for business as you have indicated above.  Therefore if you only used 10% for your office then only 10% can be applied for your GST credit.  For your personal tax return you can add the unclaimed GST amount back to the total home expense as it is prorated for you in the software.

Same logic can be used for the fuel receipts.