Inclusion Criteria:  Ages between 18 and 75 Race/ethnicity: all races and ethnic groups Sex/Gender: all Capacity to provide informed consent  Subjective tinnitus symptoms confirmed by patient self report meeting the following criteria:  Present for at least one year prior to start of study Present (can be heard when consciously attended to) >50% of awake time Intrudes (is heard even when attempting to ignore/mask) >10% of awake time Has discussed tinnitus symptoms with clinician (i.e., physician, audiologist) to confirm low/no likelihood of physical or neurological origin of tinnitus symptoms (e.g., acoustic neuroma, Meniere's Disease, etc.), confirmed by patient self-report Stable standard or no pharmacological treatment regimen for tinnitus with no change in treatment 6 weeks prior to study start  Exclusion Criteria:  Ages below 18 (neurobiology is quite different in children vs. adults) Ages above 75 (cortical excitability changes with age)  Tinnitus symptoms with known medial origin, including:  Meniere's disease Pulsatile tinnitus Acoustic neuroma Spontaneous optoacoustic emissions Any other known medical origin Severe mood disorder (major depression or anxiety)  Diagnosis of any medical condition potentially affecting brain function, including:  neuropsychiatric or mental disorders (bipolar, post-traumatic stress disorder, etc.) severe mood disorders (major depression or anxiety) psychotic states or disorders developmental disorders neurological disorders, including mild cognitive impairment significant head injury significant history of alcohol/substance abuse or dependence active chronic pain condition (>1 year duration) other major medical conditions (e.g., cancer, stroke).  MRI contraindications:  metal or other implants that are not MR-safe claustrophobia pregnancy or suspected pregnancy  tDCS contraindications*:  skin conditions or injuries on the scalp hair extensions, wigs, braids, etc. that cannot be removed prior to the study metal implants or pacemakers (also contraindicated for MRI) Non-English speakers (due to written consent and questionnaires administered) Significant history of alcohol/substance abuse or dependence within last 12 months Neurostimulation or neuromodulation treatment longer than 20 minutes within the past 3 months Current medication use potentially affecting brain function, including decongestants, antihistamines, benzodiazepines or other anticonvulsants, or anti-psychotics.