When a guarantor is added to an application, their income is taken into account and overrides the primary applicant's income. Properties typically have different income requirements for leaseholders and guarantors, so a guarantor's verified income will be calculated using a different RTI (rent-to-income ratio).
Please check directly with the property you're applying at about their requirements.
Example:
Rosebud Towers has the following income qualification criteria:
Primary Applicant RTI: 3x the monthly rent
Guarantor RTI: 6x the monthly rent
Primary Applicant applying alone verified for $70,000: pre-qualified household amount = $1944.44
Guarantor added and verified for $125,000: pre-qualified household amount = $1736