For info:
Honeywell health insurance will carry forward for the duration of your severance, through the end of the month of your last paycheck (even if last paycheck was on the 1st of the month, you have health insurance to the end of that month). When you apply to ACA, you will apply for the NEXT month following the month that you received your last paycheck.
At the end of the year you will get an IRS form listing when you had health insurance through Honeywell, and how much it cost. You will get a similar form from ACA listing the months/cost for the rest of the year. Keep them as you will need them for your 2018 taxes.
Manage your income through the use of your Roth to keep your "earned income" to a very low point. Low MAGI is important in ACA for getting the best subsidy (Modified Adjusted Gross Income). Check on-line to find your magic $$ amount to stay below 4x poverty level for your family size.
I arranged for a layoff Jan/17. Got severance through July/17. I own rental houses and managed my income as described above. My accountant just finished my taxes: My taxable income was "0" and ACA costs were near "0".
It is insanity and ruinous to our country's future to continue like this, but I played by the rules and reaped the rewards. You can, too.
If you have the money, put in the max amount you can into an IRA, and fund your HSA to the max allowable for this year (layoff in March + 5 months severance for instance = 8/12 of your annual amount that you can put in...if you choose an ACA plan that accepts HSA you can put in for the entire 12 months). Both IRA and HSA come off of your gross income towards your MAGI.
It feels bad now, but you've been booted from a horrible company. Take your severance and make the most of your life...this coming from a 30+ year veteran who said "ENOUGH!!" last year. Early retirement is wonderful