A friend of mine is taking the Cambridge DELTA two years after she took the CELTA and then got her first teaching job. Just the fact that she is taking the DELTA has already got her a promotion, and in the chain she works for in a year or two she could be in a position where they pay large relocation allowances and international school fees for her kids. The only other qualification that school accepts is the Trinity Cert TESOL, and pre-cert experience counts not one jot towards position on the pay scale, promotion etc. In fact, the box on the application form simply says "post qualification teaching experience" and there is nowhere you can even write experience before your cert.
The above is an extreme example, but if you want to work for IH or Bell rather than EF or Wall Street (and trust me, you do, even though the package is not quite what I described above), then the same things are basically true. By reputation the school I worked for in Japan is somewhere between those two divisions I just explained, and you could get a job without a Cert. However, with a Cert you could be Senior Teacher in two years and DoS in four. If you didn't have a Cert and wanted to climb the slippery slope, you'd need to take a month off work and go and do it sooner or later.
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