Alexei and Marla are married, but they file separately. Alexei’s AGI is $60,000 and Marla’s AGI is $85,000. Using the threshold for single taxpayers, Alexei will get an economic impact payment of $1,200. Marla will receive $700 ($1,200 − ($85,000 − $75,000) × 0.05).
If they could agree and file a joint return, they could get a $2,400 payment. Maybe they could split the difference.