Commonwealth Bank yesterday unveiled a small business smartphone application that, when coupled with its Leo or new Emmy mobile point of sale devices allows businesses to issue quotes, invoices, track supplies and collect payments.The CommBank Small Business app, which has been developed using CommBank's Pi software platform, will be released for both iOS and Android smartphones.It takes the bank into the realm of accounting software and blurs the line further between accounting and banking. CBA's app for example offers estimate and invoice creation, payment tracking and debt management, and also allows merchants to store inventory details.Files from the app can be exported in the CSV format into most accounting or general ledger systems.CBA group executive of enterprise services and CIO Michael Harte said that the solution was intended to help small businesses manage both their finances and their business, adding. "We can provide adjacent services and partner with Xero and MYOB. We want to be in the ecosystem," Harte said.Mobile payments is an increasingly crowded space with banks and technology companies jostling for space. MYOB for example has used Mint Wireless's technology to launch its PayDirect solution which turns a mobile phone into a card reader, Tappr offers the Juvo payment system, and rumours regularly flare that Square is planning an Australian foray.Despite all the activity there is scant information about the scale of mobile payments overall. CBA is however banking on the enthusiasm for mobility already demonstrated by Australia's 2 million small businesses, claiming that 76 per cent already have a smartphone, and half regularly do their banking from the phone.While the Small Business app is free, the new Emmy device will be made available from June through a series of mobile-phone style plans starting at $30 a month which includes the cost of a business transaction account and up to $1500 of card turnover each month. CBA charges 1.5 per cent for transactions above that limit.For merchants expecting larger monthly sales volumes the bank is offering other plans costing $60 or $90 a month. Once they are signed up, small businesses are also automatically set up to accept BPay payments.The Emmy device is targeted specifically at small businesses while CBA's Leo and Albert point of sale devices are aimed at larger companies, which may also need a barcode reader or receipt printer.The tablet sized Albert device, first announced in July 2012, has taken much longer to develop than originally anticipated, however Australian field trials of the system will begin in the next few days according to Andrew Cheesman, managing director of merchant solutions for CBA. He said the first two merchants had already signed up for the trial with a further 13 earmarked for field trials.The device is midway through EMV certification.