The number of home loans in arrears in Australia increased during the first quarter of 2016, with delinquencies up by more than seven per cent from the same period one year ago. At 1.13 per cent, however, the percentage of mortgages in arrears for  more than 30 days is relatively low and remains well below the historical peak of 1.69 per cent in 2012.Mortgage arrears increased in every state and territory during Q1. Western Australia recorded the highest arrears of 1.77 per cent, followed by Tasmania at 1.51 per cent and Queensland at 1.42 per cent. New South Wales and the Australian Capital Territory continued to have the nation's lowest levels of mortgage stress in Q1, with both reporting arrears rates below one per cent.The weighted-average Standard & Poor's Performance Index (SPIN), which measures all Australian RMBS transactions covered by S&P that are more than 30 days in arrears, continued to rise during Q1, reaching 1.13 per cent. A slowdown in mining industry work is behind the higher arrears rates in WA and  Queensland while a higher unemployment rate in Tasmania has pushed up the arrears rate in that state.Figures from this week's CoreLogic Weekly Market Update to Sunday 6 June, while not addressing mortgage arrears, shows that vendor discounting ranges across all states, from just below five per cent (for Melbourne and Sydney, respectively) to over 15 per cent for Darwin, along with slight declines in total sales.