Should I flip this deal or hold it?

[Christopher Reiser]

I am under contract on a 3 bed 1 bath single story property for $67,000. Based on nearby comps I believe the property could sell for around $120,000, after a $15,000 rehab, basically need mostly cosmetic updates: drywall repair, new flooring throughout, paint and basic update on bathroom and kitchen. I'll do most the work myself. I should be able to get about $900/month rent. I'll be doing 20% down on a 20 year amortized at 4%. Taxes for the year are $1000 and insurance will be about 700 for the year. I have $40,000 in cash which will cover down payment and rehab. If I did my math correctly I should be able to BRRRR it and pull all my investment out, but in order for it to cash flow I would have to leave 40% equity in the property, or I could flip it and double my capital.