Yes, you are right. HoH with 3 kids and EIC and child tax credit is definitely better for YOU.
The only way to be sure which way is best for BOTH of you would be to prepare trial returns*. Even if MFJ was best; you'd have to agree on how to split the $.
*This tool may be useful for test returns: <a rel="nofollow" target="_blank" href="
https://turbotax.intuit.com/tax-tools/calculators/taxcaster/?s=1">https://turbotax.intuit.com/tax-to...>.
