I expect to FIRE within the next two months, and my spouse plans to cut back to part time soon after that (and then he will fully FIRE within 1-3 years). We are planning to re-do our home equity line (HELOC) and refinance our mortgage very soon (we talked with a banker and I plan to submit the application within the next week).
We have about 15.5 years left on our current mortgage at 3.375%. We would be refinancing with the same lender at 2.99% for 30 years. We plan to continue to pay what we pay now on it each month so that it is still paid in about 15.5 years. The closing costs will be around $2500 and we will save about $185 per year by refinancing (so, obviously not much savings there).
The main reason we would like to refinance is that it will allow us to be more flexible with our monthly mortgage payment (the minimum monthly principal and interest payment will be about $739/month with the refinance instead of $1188/month). So if for some reason we run into any hiccups in our FIRE plan (for example, if our income drops a lot somehow or our expenses suddenly increase significantly), then we have more wiggle room (like an extra $5,000/year that we can divert from the mortgage to other expenses, if needed).
I am just interested to hear others' thoughts about this and whether anyone has done this before or sees any reason why this wouldn't be a good idea for us at this point. I'm not seeing any downsides to it, but since we're about to FIRE, I thought I would get some input from others who may have done this or at least looked into it before.