I want dispel a myth that I hear repeated quite often on BP and elsewhere... this seems especially important for folks looking to use the BRRRR strategy...

Here's the myth:  "Investors must always wait 6 to 12 months to refinance a newly acquired property onto a conventional loan."

In my experience, this is not true.  You can refinance immediately in most cases.  

The rules are different depending on whether you paid cash or used a loan to acquire the subject property.   Without trying to be exhaustive on all the details, here are the basics:

If you paid cash 
(including borrowed cash from HELOCs on other properties, lines of credit.)

• You can "cash-out" up to 75% LTV (70% LTV for 2-4 unit properties) immediately. (This is done using Fannie Mae's "delayed financing" exception. 

If you got a loan
(including hard/private Money, etc. w/a lien on the subject property)

• You can do a "rate/term" refinance (no cash-out) immediately up to 85% LTV. (2-4 unit properties are limited to 75% LTV)
• You can do a "cash-out" refinance after 6 months of ownership seasoning

Keep in mind that during the first 12 months, the LTV is going to be based on the lower of the purchase price or the appraised value.   However, if you can document rehab costs to justify the higher appraised value in the mind of the underwriter, you can use the APPRAISED value to calculate the maximum LTV as soon as the rehab is finished.

Hope this helps a few of you out there!