"Households will remain net payers of interest," CBA says in a report released yesterday."Households became net payers of interest in the early 1990's. This is because the value of household debt offsets the value of household financial assets. "The current low level of interest rates have made a net positive change to household interest payments," CBA said."On a decade average basis, interest paid subtracted around 0.5 percentage points per annum from disposable income. "But, over recent periods the reduction in net interest paid has been adding to disposable income."Interest rate headwinds will return, however, CBA said."We expect the RBA to start increasing interest rates from February with a 25 basis points rate hike."Interest rate hikes will reduce disposable income growth in 2015, they said."Dividend growth has also been significant recently as companies have allocated retained earnings back to shareholders. "This growth in dividends will be positive for household net income positions and partly offset the expected increase in interest payments."A lower savings ratio is one more factor "that would lift consumer spending growth," CBA said.